diff --git a/bin/build.cjs b/bin/build.cjs
index 9761117..8d0be34 100644
--- a/bin/build.cjs
+++ b/bin/build.cjs
@@ -18,9 +18,12 @@ import $$ from "../src/index.js";
 window.$$ = $$;
 `.trimStart();
   Readable.from([browser_index_js]).pipe(
-    fs.createWriteStream(path.resolve(__dirname, "../dist/browser_index.js"), {
-      flags: "w",
-    })
+    fs.createWriteStream(
+      path.resolve(__dirname, `../dist/${BROWSER_INDEX_FILENAME}.js`),
+      {
+        flags: "w",
+      }
+    )
   );
 
   await new Promise((resolve, reject) =>
diff --git a/doc/API.md b/doc/API.md
index 937d3b6..a715a23 100644
--- a/doc/API.md
+++ b/doc/API.md
@@ -174,6 +174,20 @@ svg 엘리먼트에 총 3개의 `SVGTransform`을 순서대로 추가합니다.
 2번 `SVGTransform` 객체를 반환합니다.
 1번, 3번 `SVGTranform` 객체는 회전 중심을 설정합니다.
 
+## \$\$initScaleTransform
+
+- [source](../src/initScaleTransform/initScaleTransform.index.js)
+- [detail](../src/initScaleTransform/README.md)
+
+svg 엘리먼트에 총 3개의 `SVGTransform`을 순서대로 추가합니다.
+
+1. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index`: `0`)
+2. `SVGTransform.SVG_TRANSFORM_SCALE` 타입의 `SVGTransform` (`index`: `1`)
+3. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index`: `2`)
+
+2번 `SVGTransform` 객체를 반환합니다.
+1번, 3번 `SVGTranform` 객체는 scale 중심을 설정합니다.
+
 ## \$\$initTranslateTransform
 
 - [source](../src/initTranslateTransform/initTranslateTransform.index.js)
diff --git a/package-lock.json b/package-lock.json
index e55f9de..eb8e0ca 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "fxsvg",
-  "version": "0.1.2",
+  "version": "0.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index f34d23b..530b7cb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fxsvg",
-  "version": "0.1.2",
+  "version": "0.2.0",
   "description": "Functional SVG Handling Library",
   "type": "module",
   "main": "./src/index.js",
diff --git a/src/fxsvg.js b/src/fxsvg.js
index 37553ca..5320481 100644
--- a/src/fxsvg.js
+++ b/src/fxsvg.js
@@ -20,6 +20,7 @@ import { $$getCenterPoint } from "./getCenterPoint/getCenterPoint.index.js";
 import { $$getSVG, $$setSVG } from "./getSetSVG/getSetSVG.index.js";
 import { $$initMatrixTransform } from "./initMatrixTransform/initMatrixTransform.index.js";
 import { $$initRotateTransform } from "./initRotateTransform/initRotateTransform.index.js";
+import { $$initScaleTransform } from "./initScaleTransform/initScaleTransform.index.js";
 import { $$initTranslateTransform } from "./initTranslateTransform/initTranslateTransform.index.js";
 import { $$isMatrixSVGTransform } from "./isMatrixSVGTransform/isMatrixSVGTransform.index.js";
 import { $$isRotateSVGTransform } from "./isRotateSVGTransform/isRotateSVGTransform.index.js";
@@ -56,6 +57,7 @@ export const FxSVG = {
   setSVG: $$setSVG,
   initMatrixTransform: $$initMatrixTransform,
   initRotateTransform: $$initRotateTransform,
+  initScaleTransform: $$initScaleTransform,
   initTranslateTransform: $$initTranslateTransform,
   isMatrixSVGTransform: $$isMatrixSVGTransform,
   isRotateSVGTransform: $$isRotateSVGTransform,
diff --git a/src/getBoxPoints/getBoxPoints.spec.js b/src/getBoxPoints/getBoxPoints.spec.js
index ba5ea9e..26b698d 100644
--- a/src/getBoxPoints/getBoxPoints.spec.js
+++ b/src/getBoxPoints/getBoxPoints.spec.js
@@ -131,7 +131,7 @@ describe(`$$getBoxPoints`, function () {
       $el.setAttributeNS(
         null,
         "transform",
-        makeRandomTransformAttributeValue(1)
+        makeRandomTransformAttributeValue(1, 10, () => makeRandomInt(-10, 10))
       );
 
       const { transformed, bounding } = $$getBoxPoints()($el);
diff --git a/src/index.js b/src/index.js
index 84507ba..4e4335a 100644
--- a/src/index.js
+++ b/src/index.js
@@ -20,6 +20,7 @@ export { $$getCenterPoint } from "./getCenterPoint/getCenterPoint.index.js";
 export { $$getSVG, $$setSVG } from "./getSetSVG/getSetSVG.index.js";
 export { $$initMatrixTransform } from "./initMatrixTransform/initMatrixTransform.index.js";
 export { $$initRotateTransform } from "./initRotateTransform/initRotateTransform.index.js";
+export { $$initScaleTransform } from "./initScaleTransform/initScaleTransform.index.js";
 export { $$initTranslateTransform } from "./initTranslateTransform/initTranslateTransform.index.js";
 export { $$isMatrixSVGTransform } from "./isMatrixSVGTransform/isMatrixSVGTransform.index.js";
 export { $$isRotateSVGTransform } from "./isRotateSVGTransform/isRotateSVGTransform.index.js";
diff --git a/src/initMatrixTransform/README.md b/src/initMatrixTransform/README.md
index 3f8bb72..7aef8ad 100644
--- a/src/initMatrixTransform/README.md
+++ b/src/initMatrixTransform/README.md
@@ -4,8 +4,11 @@
 - [test](./initMatrixTransform.spec.js)
 
 svg 엘리먼트에 `SVGTransform.SVG_TRANSFORM_MATRIX` 타입의 `SVGTransform` 을 추가합니다.
-`SVGTransform` 은 항상 `transform.baseVal` 에 해당하는 `SVGTransformList` 의 `0` 인덱스에 추가됩니다.
-`SVGTransformList` 는 역순으로 적용되기 때문에 추가된 `SVGTransform` 은 가장 마지막에 적용됩니다.
+`SVGTransform` 은 항상 `transform.baseVal` 에 해당하는 `SVGTransformList` 의 전달한 `index` 에 추가됩니다.
+`SVGTransformList` 는 역순으로 적용됩니다.
+
+`matrix` 값을 설정할 수 있으며 설정하지 않는 경우 Identity Matrix 로 초기화됩니다.
+`SVGTransform`을 삽입할 `index` 를 설정할 수 있으며 설정하지 않는 경우 `0` 으로 초기화됩니다.
 
 [`<svg></svg>` 커링](../../doc/SVG_CURRYING.md)이 적용된 함수입니다.
 
@@ -50,12 +53,14 @@ console.log($$getBaseTransformList($el));
 //   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
 
 const matrix = $$createSVGMatrix()({ a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 });
-$$initMatrixTransform()($el, { matrix });
+$$initMatrixTransform()($el, { matrix, index: 1 });
+// index 를 1 로 설정했기 때문에
+// SVGTransformList 의 1 인덱스 위치에 SVGTransform 삽입
 
 console.log($$getBaseTransformList($el));
 // SVGTransformList {0: SVGTransform, 1: SVGTransform, length: 2, numberOfItems: 2}
-// 0: SVGTransform {type: 1, matrix: SVGMatrix, angle: 0}
-//   matrix: SVGMatrix {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6}
-// 1: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
+// 0: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
 //   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
+// 1: SVGTransform {type: 1, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6}
 ```
diff --git a/src/initMatrixTransform/initMatrixTransform.index.js b/src/initMatrixTransform/initMatrixTransform.index.js
index 82703aa..25f515a 100644
--- a/src/initMatrixTransform/initMatrixTransform.index.js
+++ b/src/initMatrixTransform/initMatrixTransform.index.js
@@ -1,9 +1,13 @@
+import { $$createSVGMatrix } from "../createSVGMatrix/createSVGMatrix.index.js";
 import { $$createSVGTransformMatrix } from "../createSVGTransformMatrix/createSVGTransformMatrix.index.js";
 import { $$getBaseTransformList } from "../getBaseTransformList/getBaseTransformList.index.js";
 import { $$getSVG } from "../getSetSVG/getSetSVG.index.js";
 
-export const $$initMatrixTransform = ($svg = $$getSVG()) => ($el, { matrix }) =>
+export const $$initMatrixTransform = ($svg = $$getSVG()) => (
+  $el,
+  { matrix = $$createSVGMatrix()(), index = 0 } = {}
+) =>
   $$getBaseTransformList($el).insertItemBefore(
     $$createSVGTransformMatrix($svg)({ matrix }),
-    0
+    index
   );
diff --git a/src/initMatrixTransform/initMatrixTransform.spec.js b/src/initMatrixTransform/initMatrixTransform.spec.js
index b2ace55..74be1c0 100644
--- a/src/initMatrixTransform/initMatrixTransform.spec.js
+++ b/src/initMatrixTransform/initMatrixTransform.spec.js
@@ -1,62 +1,118 @@
 import { expect } from "chai";
-import { drop, go1 } from "fxjs2";
-import { deepCopyTransformListToMatrixList } from "../../test/utils/deepCopyTransformListToMatrixList.js";
-import { makeRandomNumber } from "../../test/utils/makeRandomNumber.js";
-import { makeRandomSVGMatrix } from "../../test/utils/makeRandomSVGMatrix.js";
-import { makeRandomTransformAttributeValue } from "../../test/utils/makeRandomTransformAttributeValue.js";
+import { appendL, each, equals2, go, go1, mapL, object } from "fxjs2";
+import { expectSameValueSVGMatrix } from "../../test/assertions/index.js";
+import {
+  makeRandomSVGMatrix,
+  makeRandomNumber,
+  makeRandomInt,
+  deepCopyTransformListToMatrixList,
+  makeRandomTransformAttributeValue,
+  makeAllCombinations,
+} from "../../test/utils/index.js";
+import { $$createSVGMatrix } from "../createSVGMatrix/createSVGMatrix.index.js";
 import { $$el } from "../el/el.index.js";
 import { $$getBaseTransformList } from "../getBaseTransformList/getBaseTransformList.index.js";
 import { $$isMatrixSVGTransform } from "../isMatrixSVGTransform/isMatrixSVGTransform.index.js";
 import { $$initMatrixTransform } from "./initMatrixTransform.index.js";
 
-describe(`$$initMatrixTransform`, function () {
-  let $el;
-
-  beforeEach(function () {
-    $el = $$el()(`
-      <rect
-        x="${makeRandomNumber()}"
-        y="${makeRandomNumber()}"
-        width="${makeRandomNumber(1)}"
-        height="${makeRandomNumber(1)}"
-        ${go1(makeRandomTransformAttributeValue(), (t) =>
-          t ? `transform="${t}"` : ""
-        )}
-      >
-      </rect> 
-    `);
-  });
+const createMockEl = () =>
+  $$el()(`
+    <rect
+      x="${makeRandomNumber()}"
+      y="${makeRandomNumber()}"
+      width="${makeRandomNumber(1)}"
+      height="${makeRandomNumber(1)}"
+      ${go1(makeRandomTransformAttributeValue(), (t) =>
+        t ? `transform="${t}"` : ""
+      )}
+    >
+    </rect> 
+  `);
 
-  it(`The length of the element's SVGTransformList will be increased by 1.`, function () {
-    const { numberOfItems: before_n } = $$getBaseTransformList($el);
+const expectCorrectSVGTransformListLength = ($el, config) => {
+  const { numberOfItems: before_n } = $$getBaseTransformList($el);
 
-    $$initMatrixTransform()($el, { matrix: makeRandomSVGMatrix() });
+  $$initMatrixTransform()($el, config);
 
-    const { numberOfItems: after_n } = $$getBaseTransformList($el);
-    expect(after_n).to.equal(before_n + 1);
-  });
+  const { numberOfItems: after_n } = $$getBaseTransformList($el);
+  expect(after_n, "expectCorrectSVGTransformListLength").to.equal(before_n + 1);
+};
 
-  it(`The first SVGTransform will be a matrix SVGTransform with the input SVGMatrix.`, function () {
-    const matrix = makeRandomSVGMatrix();
+const expectCorrectSVGTransform = ($el, config) => {
+  const { matrix = $$createSVGMatrix()(), index = 0 } = config || {};
 
-    $$initMatrixTransform()($el, { matrix });
+  $$initMatrixTransform()($el, config);
 
-    const t = $$getBaseTransformList($el).getItem(0);
-    expect($$isMatrixSVGTransform(t)).to.be.true;
-    expect(t.matrix).to.deep.equal(matrix);
-  });
+  const t = $$getBaseTransformList($el).getItem(index);
+  expect($$isMatrixSVGTransform(t), "expectCorrectSVGTransform").to.be.true;
+  expectSameValueSVGMatrix(t.matrix, matrix, "expectCorrectSVGTransform");
+};
 
-  it(`The function do nothing on other SVGTransforms of the element.`, function () {
-    const before_l = deepCopyTransformListToMatrixList(
-      $$getBaseTransformList($el)
-    );
+const expectCorrectOtherSVGTransforms = ($el, config) => {
+  const { index = 0 } = config || {};
+
+  const before_l = deepCopyTransformListToMatrixList(
+    $$getBaseTransformList($el)
+  );
+
+  $$initMatrixTransform()($el, config);
 
-    $$initMatrixTransform()($el, { matrix: makeRandomSVGMatrix() });
+  let after_l = deepCopyTransformListToMatrixList($$getBaseTransformList($el));
+  after_l = [...after_l.slice(0, index), ...after_l.slice(index + 1)];
+  expect(after_l, "expectCorrectOtherSVGTransforms").to.deep.equal(before_l);
+};
+
+const expectAllCorrect = ($el, config) =>
+  each((f) => f($el, config), [
+    expectCorrectSVGTransformListLength,
+    expectCorrectSVGTransform,
+    expectCorrectOtherSVGTransforms,
+  ]);
+
+describe(`$$initMatrixTransform`, function () {
+  describe(`No omitted arguments,`, function () {
+    it(`The length of the element's SVGTransformList will be increased by 1.`, function () {
+      const $el = createMockEl();
+      const matrix = makeRandomSVGMatrix();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      expectCorrectSVGTransformListLength($el, { matrix, index });
+    });
+
+    it(`The SVGTransform at input index is a matrix SVGTransform with the input SVGMatrix.`, function () {
+      const $el = createMockEl();
+      const matrix = makeRandomSVGMatrix();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      expectCorrectSVGTransform($el, { matrix, index });
+    });
+
+    it(`The function do nothing on other SVGTransforms of the element.`, function () {
+      const $el = createMockEl();
+      const matrix = makeRandomSVGMatrix();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      expectCorrectOtherSVGTransforms($el, { matrix, index });
+    });
+  });
 
-    const after_l = drop(
-      1,
-      deepCopyTransformListToMatrixList($$getBaseTransformList($el))
+  it(`If the second argument is omitted, use default values ({ matrix: Identity Matrix, index: 0 }).`, function () {
+    go(
+      ["matrix", "index"],
+      makeAllCombinations,
+      mapL((ks) => [createMockEl(), ks]),
+      mapL(([$el, ks]) =>
+        go(
+          ks,
+          mapL((k) => [
+            k,
+            equals2(k, "index")
+              ? makeRandomInt(0, $$getBaseTransformList($el).numberOfItems)
+              : makeRandomSVGMatrix(),
+          ]),
+          object,
+          (config) => [$el, config]
+        )
+      ),
+      appendL([createMockEl()]),
+      each(([$el, config]) => expectAllCorrect($el, config))
     );
-    expect(after_l).to.deep.equal(before_l);
   });
 });
diff --git a/src/initRotateTransform/README.md b/src/initRotateTransform/README.md
index 9af6119..60a5f05 100644
--- a/src/initRotateTransform/README.md
+++ b/src/initRotateTransform/README.md
@@ -5,16 +5,16 @@
 
 svg 엘리먼트에 총 3개의 `SVGTransform`을 순서대로 추가합니다.
 
-1. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index`: `0`)
-2. `SVGTransform.SVG_TRANSFORM_ROTATE` 타입의 `SVGTransform` (`index`: `1`)
-3. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index`: `2`)
+1. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index`)
+2. `SVGTransform.SVG_TRANSFORM_ROTATE` 타입의 `SVGTransform` (`index + 1`)
+3. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index + 2`)
 
 2번 `SVGTransform` 객체를 반환합니다.
 1번, 3번 `SVGTranform` 객체는 회전 중심을 설정합니다.
 
-회전 중심 `cx`, `cy` 를 설정할 수 있습니다.
-초기 회전 각도 `angle` 을 설정할 수 있습니다. 단위는 `deg` 입니다.
-설정하지 않는 경우 모두 `0` 으로 초기화됩니다.
+회전 중심 `cx`, `cy` 를 설정할 수 있습니다. 설정하지 않는 경우 모두 `0` 으로 초기화됩니다.
+초기 회전 각도 `angle` 을 설정할 수 있습니다. 단위는 `deg` 입니다. 설정하지 않는 경우 `0` 으로 초기화됩니다.
+`SVGTransform` 을 추가할 `index` 를 설정할 수 있습니다. 설정하지 않는 경우 `0` 으로 초기화됩니다.
 
 [`<svg></svg>` 커링](../../doc/SVG_CURRYING.md)이 적용된 함수입니다.
 
@@ -32,7 +32,7 @@ const $el = $$el()(`
 console.log($$getBaseTransformList($el));
 // SVGTransformList {length: 0, numberOfItems: 0}
 
-$$initRotateTransform()($el, { tx: 10, ty: 20 });
+$$initRotateTransform()($el, { angle: 30, cx: 10, cy: 20 });
 
 console.log($$getBaseTransformList($el));
 // SVGTransformList {0: SVGTransform, 1: SVGTransform, 2: SVGTransform, length: 3, numberOfItems: 3}
@@ -60,15 +60,18 @@ console.log($$getBaseTransformList($el));
 // 0: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
 //   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
 
-$$initTranslateTransform()($el, { tx: 10, ty: 20 });
+$$initRotateTransform()($el, { cx: 10, cy: 20, angle: 30, index: 1 });
+// index 를 1 로 설정할 경우
+// 기존 SVGTransformList 의 1 번 인덱스부터 3개의 SVGTransform 이 추가됨
+// 즉 1, 2, 3 번 인덱스 사용
 
 console.log($$getBaseTransformList($el));
 // SVGTransformList {0: SVGTransform, 1: SVGTransform, 2: SVGTransform, 3: SVGTransform, length: 4, numberOfItems: 4}
-// 0: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+// 0: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
+// 1: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
 //   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: 10, f: 20}
-// 1: SVGTransform {type: 4, matrix: SVGMatrix, angle: 30}
-// 2: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+// 2: SVGTransform {type: 4, matrix: SVGMatrix, angle: 30}
+// 3: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
 //   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: -10, f: -20}
-// 3: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
-//   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
 ```
diff --git a/src/initRotateTransform/initRotateTransform.index.js b/src/initRotateTransform/initRotateTransform.index.js
index 10db431..abee62c 100644
--- a/src/initRotateTransform/initRotateTransform.index.js
+++ b/src/initRotateTransform/initRotateTransform.index.js
@@ -5,21 +5,21 @@ import { $$getSVG } from "../getSetSVG/getSetSVG.index.js";
 
 export const $$initRotateTransform = ($svg = $$getSVG()) => (
   $el,
-  { angle = 0, cx = 0, cy = 0 } = {}
+  { angle = 0, cx = 0, cy = 0, index = 0 } = {}
 ) => {
   const transform_list = $$getBaseTransformList($el);
 
   transform_list.insertItemBefore(
     $$createSVGTransformTranslate($svg)({ tx: -cx, ty: -cy }),
-    0
+    index
   );
   const transform = transform_list.insertItemBefore(
     $$createSVGTransformRotate($svg)({ angle }),
-    0
+    index
   );
   transform_list.insertItemBefore(
     $$createSVGTransformTranslate($svg)({ tx: cx, ty: cy }),
-    0
+    index
   );
 
   return transform;
diff --git a/src/initRotateTransform/initRotateTransform.spec.js b/src/initRotateTransform/initRotateTransform.spec.js
index e1377a9..a248d6a 100644
--- a/src/initRotateTransform/initRotateTransform.spec.js
+++ b/src/initRotateTransform/initRotateTransform.spec.js
@@ -1,7 +1,19 @@
 import { expect } from "chai";
-import { drop, go1, mapL, rangeL } from "fxjs2";
+import {
+  appendL,
+  each,
+  equals2,
+  go,
+  go1,
+  mapL,
+  object,
+  rangeL,
+  rejectL,
+} from "fxjs2";
+import { expectSameValueSVGMatrix } from "../../test/assertions/index.js";
 import {
   deepCopyTransformListToMatrixList,
+  makeAllCombinations,
   makeRandomInt,
   makeRandomNumber,
   makeRandomTransformAttributeValue,
@@ -12,90 +24,154 @@ import { $$isRotateSVGTransform } from "../isRotateSVGTransform/isRotateSVGTrans
 import { $$isTranslateSVGTransform } from "../isTranslateSVGTransform/isTranslateSVGTransform.index.js";
 import { $$initRotateTransform } from "./initRotateTransform.index.js";
 
-describe(`$$initRotateTransform`, function () {
-  let $el;
-
-  beforeEach(function () {
-    $el = $$el()(`
-      <rect
-        x="${makeRandomNumber()}"
-        y="${makeRandomNumber()}"
-        width="${makeRandomNumber(1)}"
-        height="${makeRandomNumber(1)}"
-        ${go1(makeRandomTransformAttributeValue(), (t) =>
-          t ? `transform="${t}"` : ""
-        )}
-      >
-      </rect> 
-    `);
-  });
-
-  it(`The length of the element's SVGTransformList will be increased by 3.`, function () {
-    const { numberOfItems: before_n } = $$getBaseTransformList($el);
+const createMockEl = () =>
+  $$el()(`
+    <rect
+      x="${makeRandomNumber()}"
+      y="${makeRandomNumber()}"
+      width="${makeRandomNumber(1)}"
+      height="${makeRandomNumber(1)}"
+      ${go1(makeRandomTransformAttributeValue(), (t) =>
+        t ? `transform="${t}"` : ""
+      )}
+    >
+    </rect> 
+  `);
+
+const expectCorrectSVGTransformListLength = ($el, config) => {
+  const { numberOfItems: before_n } = $$getBaseTransformList($el);
+
+  $$initRotateTransform()($el, config);
+
+  const { numberOfItems: after_n } = $$getBaseTransformList($el);
+  expect(after_n, "expectCorrectSVGTransformListLength").to.equal(before_n + 3);
+};
+
+const expectCorrectSVGTransform1 = ($el, config) => {
+  const { index = 0, cx = 0, cy = 0 } = config || {};
+
+  $$initRotateTransform()($el, config);
+
+  const t = $$getBaseTransformList($el).getItem(index);
+  expect($$isTranslateSVGTransform(t), "expectCorrectSVGTransform1").to.be.true;
+  expectSameValueSVGMatrix(
+    t.matrix,
+    { a: 1, b: 0, c: 0, d: 1, e: cx, f: cy },
+    "expectCorrectSVGTransform1"
+  );
+};
+
+const expectCorrectSVGTransform2 = ($el, config) => {
+  const { index = 0, angle = 0 } = config || {};
+
+  $$initRotateTransform()($el, config);
+
+  const t = $$getBaseTransformList($el).getItem(index + 1);
+  expect($$isRotateSVGTransform(t), "expectCorrectSVGTransform2").to.be.true;
+  expect(t.angle).to.equal(angle);
+  expect(t.matrix.e).to.equal(0);
+  expect(t.matrix.f).to.equal(0);
+};
+
+const expectCorrectSVGTransform3 = ($el, config) => {
+  const { index = 0, cx = 0, cy = 0 } = config || {};
+
+  $$initRotateTransform()($el, config);
+
+  const t = $$getBaseTransformList($el).getItem(index + 2);
+  expect($$isTranslateSVGTransform(t), "expectCorrectSVGTransform3").to.be.true;
+  expectSameValueSVGMatrix(
+    t.matrix,
+    { a: 1, b: 0, c: 0, d: 1, e: -cx, f: -cy },
+    "expectCorrectSVGTransform3"
+  );
+};
+
+const expectCorrectOtherSVGTransforms = ($el, config) => {
+  const { index = 0 } = config || {};
+
+  const before_l = deepCopyTransformListToMatrixList(
+    $$getBaseTransformList($el)
+  );
+
+  $$initRotateTransform()($el, config);
+
+  let after_l = deepCopyTransformListToMatrixList($$getBaseTransformList($el));
+  after_l = [...after_l.slice(0, index), ...after_l.slice(index + 3)];
+  expect(after_l, "expectCorrectOtherSVGTransforms").to.deep.equal(before_l);
+};
+
+const expectAllCorrect = ($el, config) =>
+  each((f) => f($el, config), [
+    expectCorrectSVGTransformListLength,
+    expectCorrectSVGTransform1,
+    expectCorrectSVGTransform2,
+    expectCorrectSVGTransform3,
+    expectCorrectOtherSVGTransforms,
+  ]);
 
-    $$initRotateTransform()($el, {
-      angle: makeRandomNumber(),
-      cx: makeRandomNumber(),
-      cy: makeRandomNumber(),
+describe(`$$initRotateTransform`, function () {
+  describe(`No omitted arguments.`, function () {
+    it(`The length of the element's SVGTransformList will be increased by 3.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [angle, cx, cy] = mapL(() => makeRandomNumber(), rangeL(3));
+      expectCorrectSVGTransformListLength($el, { angle, cx, cy, index });
     });
 
-    const { numberOfItems: after_n } = $$getBaseTransformList($el);
-    expect(after_n).to.equal(before_n + 3);
-  });
-
-  it(`The first SVGTransform will be a translate SVGTransform with cx, cy.`, function () {
-    const [cx, cy] = mapL(() => makeRandomInt(), rangeL(2));
-
-    $$initRotateTransform()($el, { angle: makeRandomNumber(), cx, cy });
-
-    const t = $$getBaseTransformList($el).getItem(0);
-    expect($$isTranslateSVGTransform(t)).to.be.true;
-    expect(t.matrix.e).to.equal(cx);
-    expect(t.matrix.f).to.equal(cy);
-  });
-
-  it(`The second SVGTransform will be a rotate SVGTransform with angle, cx = 0, cy = 0.`, function () {
-    const angle = makeRandomInt();
-
-    $$initRotateTransform()($el, {
-      angle,
-      cx: makeRandomNumber(),
-      cy: makeRandomNumber(),
+    it(`The first SVGTransform will be a translate SVGTransform with cx, cy.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy] = mapL(() => makeRandomInt(), rangeL(2));
+      const angle = makeRandomNumber();
+      expectCorrectSVGTransform1($el, { index, cx, cy, angle });
     });
 
-    const t = $$getBaseTransformList($el).getItem(1);
-    expect($$isRotateSVGTransform(t)).to.be.true;
-    expect(t.angle).to.equal(angle);
-    expect(t.matrix.e).to.equal(0);
-    expect(t.matrix.f).to.equal(0);
-  });
-
-  it(`The third SVGTransform will be a translate SVGTransform with -cx, -cy.`, function () {
-    const [cx, cy] = mapL(() => makeRandomInt(), rangeL(2));
-
-    $$initRotateTransform()($el, { angle: makeRandomNumber(), cx, cy });
-
-    const t = $$getBaseTransformList($el).getItem(2);
-    expect($$isTranslateSVGTransform(t)).to.be.true;
-    expect(t.matrix.e).to.equal(-cx);
-    expect(t.matrix.f).to.equal(-cy);
-  });
+    it(`The second SVGTransform will be a rotate SVGTransform with angle, cx = 0, cy = 0.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy] = mapL(() => makeRandomNumber(), rangeL(2));
+      const angle = makeRandomInt();
+      expectCorrectSVGTransform2($el, { angle, cx, cy, index });
+    });
 
-  it(`The function do nothing on other SVGTransforms of the element.`, function () {
-    const before_l = deepCopyTransformListToMatrixList(
-      $$getBaseTransformList($el)
-    );
+    it(`The third SVGTransform will be a translate SVGTransform with -cx, -cy.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy] = mapL(() => makeRandomInt(), rangeL(2));
+      const angle = makeRandomNumber();
+      expectCorrectSVGTransform3($el, { angle, cx, cy, index });
+    });
 
-    $$initRotateTransform()($el, {
-      angle: makeRandomNumber(),
-      cx: makeRandomNumber(),
-      cy: makeRandomNumber(),
+    it(`The function do nothing on other SVGTransforms of the element.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy, angle] = mapL(() => makeRandomNumber(), rangeL(3));
+      expectCorrectOtherSVGTransforms($el, { angle, cx, cy, index });
     });
+  });
 
-    const after_l = drop(
-      3,
-      deepCopyTransformListToMatrixList($$getBaseTransformList($el))
+  it(`If the second argument is omitted, use default values ({ angle: 0, cx: 0, cy: 0, index: 0 }).`, function () {
+    go(
+      ["angle", "cx", "cy", "index"],
+      makeAllCombinations,
+      rejectL((ks) => equals2(ks.length, 4)),
+      mapL((ks) => [createMockEl(), ks]),
+      mapL(([$el, ks]) =>
+        go(
+          ks,
+          mapL((k) => [
+            k,
+            equals2(k, "index")
+              ? makeRandomInt(0, $$getBaseTransformList($el).numberOfItems)
+              : makeRandomInt(),
+          ]),
+          object,
+          (config) => [$el, config]
+        )
+      ),
+      appendL([createMockEl()]),
+      each(([$el, config]) => expectAllCorrect($el, config))
     );
-    expect(after_l).to.deep.equal(before_l);
   });
 });
diff --git a/src/initScaleTransform/README.md b/src/initScaleTransform/README.md
new file mode 100644
index 0000000..6b75268
--- /dev/null
+++ b/src/initScaleTransform/README.md
@@ -0,0 +1,77 @@
+# \$\$initScaleTransform
+
+- [source](./initScaleTransform.index.js)
+- [test](./initScaleTransform.spec.js)
+
+svg 엘리먼트에 총 3개의 `SVGTransform`을 순서대로 추가합니다.
+
+1. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index`)
+2. `SVGTransform.SVG_TRANSFORM_SCALE` 타입의 `SVGTransform` (`index + 1`)
+3. `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` (`index + 2`)
+
+2번 `SVGTransform` 객체를 반환합니다.
+1번, 3번 `SVGTranform` 객체는 scale 중심을 설정합니다.
+
+scale 중심 `cx`, `cy` 를 설정할 수 있습니다. 설정하지 않는 경우 모두 `0` 으로 초기화됩니다.
+초기 scale 정도 `sx`, `sy` 를 설정할 수 있습니다. 설정하지 않는 경우 모두 `1` 으로 초기화됩니다.
+`SVGTransform` 을 추가할 `index` 를 설정할 수 있습니다. 설정하지 않는 경우 `0` 으로 초기화됩니다.
+
+[`<svg></svg>` 커링](../../doc/SVG_CURRYING.md)이 적용된 함수입니다.
+
+```javascript
+const $el = $$el()(`
+  <rect
+    x="10"
+    y="20"
+    width="100"
+    height="200"
+  >
+  </rect>
+`);
+
+console.log($$getBaseTransformList($el));
+// SVGTransformList {length: 0, numberOfItems: 0}
+
+$$initScaleTransform()($el, { sx: 2, sy: 3, cx: 10, cy: 20, index: 0 });
+
+console.log($$getBaseTransformList($el));
+// SVGTransformList {0: SVGTransform, 1: SVGTransform, 2: SVGTransform, length: 3, numberOfItems: 3}
+// 0: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: 10, f: 20}
+// 1: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 3, e: 0, f: 0}
+// 2: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: -10, f: -20}
+```
+
+```javascript
+const $el = $$el()(`
+  <rect
+    x="10"
+    y="20"
+    width="100"
+    height="200"
+    transform="rotate(30 10 20)"
+  >
+  </rect>
+`);
+
+console.log($$getBaseTransformList($el));
+// SVGTransformList {0: SVGTransform, length: 1, numberOfItems: 1}
+// 0: SVGTransform {type: 4, matrix: SVGMatrix, angle: 30}
+
+$$initScaleTransform()($el, { cx: 10, cy: 20, sx: 2, sy: 3, index: 1 });
+// index 를 1 로 설정할 경우
+// 기존 SVGTransformList 의 1 번 인덱스부터 3개의 SVGTransform 이 추가됨
+// 즉 1, 2, 3 번 인덱스 사용
+
+console.log($$getBaseTransformList($el));
+// SVGTransformList {0: SVGTransform, 1: SVGTransform, 2: SVGTransform, 3: SVGTransform, length: 4, numberOfItems: 4}
+// 0: SVGTransform {type: 4, matrix: SVGMatrix, angle: 30}
+// 1: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: 10, f: 20}
+// 2: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 3, e: 0, f: 0}
+// 3: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: -10, f: -20}
+```
diff --git a/src/initScaleTransform/initScaleTransform.index.js b/src/initScaleTransform/initScaleTransform.index.js
new file mode 100644
index 0000000..ecfef47
--- /dev/null
+++ b/src/initScaleTransform/initScaleTransform.index.js
@@ -0,0 +1,26 @@
+import { $$createSVGTransformScale } from "../createSVGTransformScale/createSVGTransformScale.index.js";
+import { $$createSVGTransformTranslate } from "../createSVGTransformTranslate/createSVGTransformTranslate.index.js";
+import { $$getBaseTransformList } from "../getBaseTransformList/getBaseTransformList.index.js";
+import { $$getSVG } from "../getSetSVG/getSetSVG.index.js";
+
+export const $$initScaleTransform = ($svg = $$getSVG()) => (
+  $el,
+  { sx = 1, sy = 1, cx = 0, cy = 0, index = 0 } = {}
+) => {
+  const transform_list = $$getBaseTransformList($el);
+
+  transform_list.insertItemBefore(
+    $$createSVGTransformTranslate($svg)({ tx: -cx, ty: -cy }),
+    index
+  );
+  const transform = transform_list.insertItemBefore(
+    $$createSVGTransformScale($svg)({ sx, sy }),
+    index
+  );
+  transform_list.insertItemBefore(
+    $$createSVGTransformTranslate($svg)({ tx: cx, ty: cy }),
+    index
+  );
+
+  return transform;
+};
diff --git a/src/initScaleTransform/initScaleTransform.spec.js b/src/initScaleTransform/initScaleTransform.spec.js
new file mode 100644
index 0000000..70ddfca
--- /dev/null
+++ b/src/initScaleTransform/initScaleTransform.spec.js
@@ -0,0 +1,169 @@
+import { expect } from "chai";
+import { appendL, each, equals2, go, go1, mapL, object, rangeL } from "fxjs2";
+import {
+  makeRandomTransformAttributeValue,
+  makeRandomNumber,
+  deepCopyTransformListToMatrixList,
+  makeAllCombinations,
+  makeRandomInt,
+} from "../../test/utils/index.js";
+import { expectSameValueSVGMatrix } from "../../test/assertions/index.js";
+import { $$el } from "../el/el.index.js";
+import { $$getBaseTransformList } from "../getBaseTransformList/getBaseTransformList.index.js";
+import { $$isScaleSVGTransform } from "../isScaleSVGTransform/isScaleSVGTransform.index.js";
+import { $$isTranslateSVGTransform } from "../isTranslateSVGTransform/isTranslateSVGTransform.index.js";
+import { $$initScaleTransform } from "./initScaleTransform.index.js";
+
+const createMockEl = () =>
+  $$el()(`
+    <rect
+      x="${makeRandomNumber()}"
+      y="${makeRandomNumber()}"
+      width="${makeRandomNumber(1)}"
+      height="${makeRandomNumber(1)}"
+      ${go1(makeRandomTransformAttributeValue(), (t) =>
+        t ? `transform="${t}"` : ""
+      )}
+    >
+    </rect> 
+  `);
+
+const expectCorrectSVGTransformListLength = ($el, config) => {
+  const { numberOfItems: before_n } = $$getBaseTransformList($el);
+
+  $$initScaleTransform()($el, config);
+
+  const { numberOfItems: after_n } = $$getBaseTransformList($el);
+  expect(after_n, "expectCorrectSVGTransformListLength").to.equal(before_n + 3);
+};
+
+const expectCorrectSVGTransform1 = ($el, config) => {
+  const { index = 0, cx = 0, cy = 0 } = config || {};
+
+  $$initScaleTransform()($el, config);
+
+  const t = $$getBaseTransformList($el).getItem(index);
+  expect($$isTranslateSVGTransform(t), "expectCorrectSVGTransform1").to.be.true;
+  expectSameValueSVGMatrix(
+    t.matrix,
+    { a: 1, b: 0, c: 0, d: 1, e: cx, f: cy },
+    "expectCorrectSVGTransform1"
+  );
+};
+
+const expectCorrectSVGTransform2 = ($el, config) => {
+  const { index = 0, sx = 1, sy = 1 } = config || {};
+
+  $$initScaleTransform()($el, config);
+
+  const t = $$getBaseTransformList($el).getItem(index + 1);
+  expect($$isScaleSVGTransform(t), "expectCorrectSVGTransform2").to.be.true;
+  expectSameValueSVGMatrix(
+    t.matrix,
+    { a: sx, b: 0, c: 0, d: sy, e: 0, f: 0 },
+    "expectCorrectSVGTransform2"
+  );
+};
+
+const expectCorrectSVGTransform3 = ($el, config) => {
+  const { index = 0, cx = 0, cy = 0 } = config || {};
+
+  $$initScaleTransform()($el, config);
+
+  const t = $$getBaseTransformList($el).getItem(index + 2);
+  expect($$isTranslateSVGTransform(t), "expectCorrectSVGTransform3").to.be.true;
+  expectSameValueSVGMatrix(
+    t.matrix,
+    { a: 1, b: 0, c: 0, d: 1, e: -cx, f: -cy },
+    "expectCorrectSVGTransform3"
+  );
+};
+
+const expectCorrectOtherSVGTransforms = ($el, config) => {
+  const { index = 0 } = config || {};
+
+  const before_l = deepCopyTransformListToMatrixList(
+    $$getBaseTransformList($el)
+  );
+
+  $$initScaleTransform()($el, config);
+
+  let after_l = deepCopyTransformListToMatrixList($$getBaseTransformList($el));
+  after_l = [...after_l.slice(0, index), ...after_l.slice(index + 3)];
+  expect(after_l, "expectCorrectOtherSVGTransforms").to.deep.equal(before_l);
+};
+
+const expectAllCorrect = ($el, config) =>
+  each((f) => f($el, config), [
+    expectCorrectSVGTransformListLength,
+    expectCorrectSVGTransform1,
+    expectCorrectSVGTransform2,
+    expectCorrectSVGTransform3,
+    expectCorrectOtherSVGTransforms,
+  ]);
+
+describe(`$$initScaleTransform`, function () {
+  describe(`No omitted arguments.`, function () {
+    it(`The length of the element's SVGTransformList will be increased by 3.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy, sx, sy] = mapL(() => makeRandomNumber(), rangeL(4));
+      expectCorrectSVGTransformListLength($el, { index, cx, cy, sx, sy });
+    });
+
+    it(`The SVGTransform at input index will be a translate SVGTransform with cx, cy.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy] = mapL(() => makeRandomInt(), rangeL(2));
+      const [sx, sy] = mapL(() => makeRandomNumber(), rangeL(2));
+      expectCorrectSVGTransform1($el, { index, cx, cy, sx, sy });
+    });
+
+    it(`The SVGTransform at index + 1 will be a scale SVGTransform with sx, sy.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy] = mapL(() => makeRandomNumber(), rangeL(2));
+      const [sx, sy] = mapL(() => makeRandomInt(), rangeL(2));
+      expectCorrectSVGTransform2($el, { index, cx, cy, sx, sy });
+    });
+
+    it(`The SVGTransform at index + 2 will be a translate SVGTransform with -cx, -cy.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [cx, cy] = mapL(() => makeRandomInt(), rangeL(2));
+      const [sx, sy] = mapL(() => makeRandomNumber(), rangeL(2));
+      expectCorrectSVGTransform3($el, { index, cx, cy, sx, sy });
+    });
+
+    it(`The function do nothing on other SVGTransforms of the element.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [sx, sy, cx, cy] = mapL(() => makeRandomNumber(), rangeL(4));
+      expectCorrectOtherSVGTransforms($el, { index, cx, cy, sx, sy });
+    });
+  });
+
+  it(`If the second argument is omitted, use default values ({ sx: 1, sy: 1, cx: 0, cy: 0, index: 0 }).`, function () {
+    this.slow(1000);
+    go(
+      ["sx", "sy", "cx", "cy", "index"],
+      makeAllCombinations,
+      mapL((ks) => [createMockEl(), ks]),
+      mapL(([$el, ks]) =>
+        go(
+          ks,
+          mapL((k) => [
+            k,
+            equals2(k, "index")
+              ? makeRandomInt(0, $$getBaseTransformList($el).numberOfItems)
+              : makeRandomInt(),
+          ]),
+          object,
+          (config) => [$el, config]
+        )
+      ),
+      appendL([createMockEl()]),
+      each(([$el, config]) => expectAllCorrect($el, config))
+    );
+  });
+});
diff --git a/src/initTranslateTransform/README.md b/src/initTranslateTransform/README.md
index d916454..bbc62bb 100644
--- a/src/initTranslateTransform/README.md
+++ b/src/initTranslateTransform/README.md
@@ -4,10 +4,11 @@
 - [test](./initTranslateTransform.spec.js)
 
 svg 엘리먼트에 `SVGTransform.SVG_TRANSFORM_TRANSLATE` 타입의 `SVGTransform` 을 추가합니다.
-`SVGTransform` 은 항상 `transform.baseVal` 에 해당하는 `SVGTransformList` 의 `0` 인덱스에 추가됩니다.
-`SVGTransformList` 는 역순으로 적용되기 때문에 추가된 `SVGTransform` 은 가장 마지막에 적용됩니다.
+`SVGTransform` 은 항상 `transform.baseVal` 에 해당하는 `SVGTransformList` 의 전달한 `index` 에 추가됩니다.
+`SVGTransformList` 는 역순으로 적용됩니다.
 
 초기 `tx`, `ty` 값을 설정할 수 있으며 설정하지 않는 경우 모두 `0` 으로 초기화됩니다.
+`SVGTrnsform`을 삽입할 `index`를 설정할 수 있으며 설정하지 않는 경우 `0` 으로 초기화됩니다.
 
 [`<svg></svg>` 커링](../../doc/SVG_CURRYING.md)이 적용된 함수입니다.
 
@@ -50,12 +51,14 @@ console.log($$getBaseTransformList($el));
 // 0: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
 //   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
 
-$$initTranslateTransform()($el, { tx: 10, ty: 20 });
+$$initTranslateTransform()($el, { tx: 10, ty: 20, index: 1 });
+// index 를 1 로 설정했기 때문에
+// SVGTransformList 의 1 인덱스 위치에 SVGTransform 삽입
 
 console.log($$getBaseTransformList($el));
 // SVGTransformList {0: SVGTransform, 1: SVGTransform, length: 2, numberOfItems: 2}
-// 0: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
-//   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: 10, f: 20}
-// 1: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
+// 0: SVGTransform {type: 3, matrix: SVGMatrix, angle: 0}
 //   matrix: SVGMatrix {a: 2, b: 0, c: 0, d: 4, e: 0, f: 0}
+// 1: SVGTransform {type: 2, matrix: SVGMatrix, angle: 0}
+//   matrix: SVGMatrix {a: 1, b: 0, c: 0, d: 1, e: 10, f: 20}
 ```
diff --git a/src/initTranslateTransform/initTranslateTransform.index.js b/src/initTranslateTransform/initTranslateTransform.index.js
index 0c8f1a1..546eac9 100644
--- a/src/initTranslateTransform/initTranslateTransform.index.js
+++ b/src/initTranslateTransform/initTranslateTransform.index.js
@@ -4,9 +4,9 @@ import { $$getSVG } from "../getSetSVG/getSetSVG.index.js";
 
 export const $$initTranslateTransform = ($svg = $$getSVG()) => (
   $el,
-  { tx = 0, ty = 0 } = {}
+  { tx = 0, ty = 0, index = 0 } = {}
 ) =>
   $$getBaseTransformList($el).insertItemBefore(
     $$createSVGTransformTranslate($svg)({ tx, ty }),
-    0
+    index
   );
diff --git a/src/initTranslateTransform/initTranslateTransform.spec.js b/src/initTranslateTransform/initTranslateTransform.spec.js
index bf6d060..f112d45 100644
--- a/src/initTranslateTransform/initTranslateTransform.spec.js
+++ b/src/initTranslateTransform/initTranslateTransform.spec.js
@@ -1,71 +1,120 @@
 import { expect } from "chai";
-import { drop, go1, mapL, rangeL } from "fxjs2";
+import { appendL, each, equals2, go, go1, mapL, object, rangeL } from "fxjs2";
 import {
   deepCopyTransformListToMatrixList,
+  makeAllCombinations,
   makeRandomInt,
   makeRandomNumber,
   makeRandomTransformAttributeValue,
 } from "../../test/utils/index.js";
+import { expectSameValueSVGMatrix } from "../../test/assertions/index.js";
 import { $$el } from "../el/el.index.js";
 import { $$getBaseTransformList } from "../getBaseTransformList/getBaseTransformList.index.js";
 import { $$isTranslateSVGTransform } from "../isTranslateSVGTransform/isTranslateSVGTransform.index.js";
 import { $$initTranslateTransform } from "./initTranslateTransform.index.js";
 
-describe(`$$initTranslateTransform`, function () {
-  let $el;
-
-  beforeEach(function () {
-    $el = $$el()(`
-      <rect
-        x="${makeRandomNumber()}"
-        y="${makeRandomNumber()}"
-        width="${makeRandomNumber(1)}"
-        height="${makeRandomNumber(1)}"
-        ${go1(makeRandomTransformAttributeValue(), (t) =>
-          t ? `transform="${t}"` : ""
-        )}
-      >
-      </rect> 
-    `);
-  });
+const createMockEl = () =>
+  $$el()(`
+    <rect
+      x="${makeRandomNumber()}"
+      y="${makeRandomNumber()}"
+      width="${makeRandomNumber(1)}"
+      height="${makeRandomNumber(1)}"
+      ${go1(makeRandomTransformAttributeValue(), (t) =>
+        t ? `transform="${t}"` : ""
+      )}
+    >
+    </rect> 
+  `);
 
-  it(`The length of the element's SVGTransformList will be increased by 1.`, function () {
-    const { numberOfItems: before_n } = $$getBaseTransformList($el);
+const expectCorrectSVGTransformListLength = ($el, config) => {
+  const { numberOfItems: before_n } = $$getBaseTransformList($el);
 
-    $$initTranslateTransform()($el, {
-      tx: makeRandomNumber(),
-      ty: makeRandomNumber(),
-    });
+  $$initTranslateTransform()($el, config);
 
-    const { numberOfItems: after_n } = $$getBaseTransformList($el);
-    expect(after_n).to.equal(before_n + 1);
-  });
+  const { numberOfItems: after_n } = $$getBaseTransformList($el);
+  expect(after_n, "expectCorrectSVGTransformListLength").to.equal(before_n + 1);
+};
 
-  it(`The first SVGTransform will be a translate SVGTransform with the input tx, ty values.`, function () {
-    const [tx, ty] = mapL(() => makeRandomInt(), rangeL(2));
+const expectCorrectSVGTransform = ($el, config) => {
+  const { index = 0, tx = 0, ty = 0 } = config || {};
 
-    $$initTranslateTransform()($el, { tx, ty });
+  $$initTranslateTransform()($el, config);
 
-    const t = $$getBaseTransformList($el).getItem(0);
-    expect($$isTranslateSVGTransform(t)).to.be.true;
-    expect(t.matrix.e).to.equal(tx);
-    expect(t.matrix.f).to.equal(ty);
-  });
+  const t = $$getBaseTransformList($el).getItem(index);
+  expect($$isTranslateSVGTransform(t), "expectCorrectSVGTransform").to.be.true;
+  expectSameValueSVGMatrix(
+    t.matrix,
+    { a: 1, b: 0, c: 0, d: 1, e: tx, f: ty },
+    "expectCorrectSVGTransform"
+  );
+};
 
-  it(`The function do nothing on other SVGTransforms of the element.`, function () {
-    const before_l = deepCopyTransformListToMatrixList(
-      $$getBaseTransformList($el)
-    );
+const expectCorrectOtherSVGTransforms = ($el, config) => {
+  const { index = 0 } = config || {};
+
+  const before_l = deepCopyTransformListToMatrixList(
+    $$getBaseTransformList($el)
+  );
+
+  $$initTranslateTransform()($el, config);
 
-    $$initTranslateTransform()($el, {
-      tx: makeRandomNumber(),
-      ty: makeRandomNumber(),
+  let after_l = deepCopyTransformListToMatrixList($$getBaseTransformList($el));
+  after_l = [...after_l.slice(0, index), ...after_l.slice(index + 1)];
+  expect(after_l, "expectCorrectOtherSVGTransforms").to.deep.equal(before_l);
+};
+
+const expectAllCorrect = ($el, config) =>
+  each((f) => f($el, config), [
+    expectCorrectSVGTransformListLength,
+    expectCorrectSVGTransform,
+    expectCorrectOtherSVGTransforms,
+  ]);
+
+describe(`$$initTranslateTransform`, function () {
+  describe(`No omitted arguments.`, function () {
+    it(`The length of the element's SVGTransformList will be increased by 1.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [tx, ty] = mapL(() => makeRandomNumber(), rangeL(2));
+      expectCorrectSVGTransformListLength($el, { tx, ty, index });
+    });
+
+    it(`The SVGTransform at input index is a translate SVGTransform with the input tx, ty values.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [tx, ty] = mapL(() => makeRandomInt(), rangeL(2));
+      expectCorrectSVGTransform($el, { index, tx, ty });
+    });
+
+    it(`The function do nothing on other SVGTransforms of the element.`, function () {
+      const $el = createMockEl();
+      const index = makeRandomInt(0, $$getBaseTransformList($el).numberOfItems);
+      const [tx, ty] = mapL(() => makeRandomNumber(), rangeL(2));
+      expectCorrectOtherSVGTransforms($el, { index, tx, ty });
     });
+  });
 
-    const after_l = drop(
-      1,
-      deepCopyTransformListToMatrixList($$getBaseTransformList($el))
+  it(`If the second argument is omitted, use default values ({ tx: 0, ty: 0, index: 0 }).`, function () {
+    go(
+      ["tx", "ty", "index"],
+      makeAllCombinations,
+      mapL((ks) => [createMockEl(), ks]),
+      mapL(([$el, ks]) =>
+        go(
+          ks,
+          mapL((k) => [
+            k,
+            equals2(k, "index")
+              ? makeRandomInt(0, $$getBaseTransformList($el).numberOfItems)
+              : makeRandomInt(),
+          ]),
+          object,
+          (config) => [$el, config]
+        )
+      ),
+      appendL([createMockEl()]),
+      each(([$el, config]) => expectAllCorrect($el, config))
     );
-    expect(after_l).to.deep.equal(before_l);
   });
 });
diff --git a/test/assertions/expectSameValueSVGMatrix.js b/test/assertions/expectSameValueSVGMatrix.js
new file mode 100644
index 0000000..adef985
--- /dev/null
+++ b/test/assertions/expectSameValueSVGMatrix.js
@@ -0,0 +1,13 @@
+import { expect } from "chai";
+import { each, go, mapL } from "fxjs2";
+
+export const expectSameValueSVGMatrix = (receive_m, expect_m, message = "") =>
+  go(
+    ["a", "b", "c", "d", "e", "f"],
+    mapL((k) => [
+      receive_m[k],
+      expect_m[k],
+      `${message ? `${message}::` : ""}expectSameValueSVGMatrix::${k}`,
+    ]),
+    each(([receive_v, expect_v, m]) => expect(receive_v, m).to.equal(expect_v))
+  );
diff --git a/test/assertions/index.js b/test/assertions/index.js
new file mode 100644
index 0000000..afadcdd
--- /dev/null
+++ b/test/assertions/index.js
@@ -0,0 +1 @@
+export { expectSameValueSVGMatrix } from "./expectSameValueSVGMatrix.js";
diff --git a/test/spec.js b/test/spec.js
index c589b9b..4b87a6a 100644
--- a/test/spec.js
+++ b/test/spec.js
@@ -20,6 +20,7 @@ import "../src/getCenterPoint/getCenterPoint.spec.js";
 import "../src/getSetSVG/getSetSVG.spec.js";
 import "../src/initMatrixTransform/initMatrixTransform.spec.js";
 import "../src/initRotateTransform/initRotateTransform.spec.js";
+import "../src/initScaleTransform/initScaleTransform.spec.js";
 import "../src/initTranslateTransform/initTranslateTransform.spec.js";
 import "../src/isMatrixSVGTransform/isMatrixSVGTransform.spec.js";
 import "../src/isRotateSVGTransform/isRotateSVGTransform.spec.js";
@@ -31,3 +32,6 @@ import "../src/updateMatrixTransform/updateMatrixTransform.spec.js";
 import "../src/updateRotateTransform/updateRotateTransform.spec.js";
 import "../src/updateScaleTransform/updateScaleTransform.sepc.js";
 import "../src/updateTranslateTransform/updateTranslateTransform.spec.js";
+
+import FxSVG from "../src/index.js";
+window.FxSVG = FxSVG;