diff --git a/src/AICC.js b/src/AICC.js
index 98ecfa5..9c78f0a 100644
--- a/src/AICC.js
+++ b/src/AICC.js
@@ -1,17 +1,23 @@
 // @flow
 import Scorm12API from './Scorm12API';
-import {CMIEvaluationCommentsObject, CMITriesObject, NAV} from './cmi/aicc_cmi';
+import {
+  CMI,
+  CMIEvaluationCommentsObject,
+  CMITriesObject,
+  NAV,
+} from './cmi/aicc_cmi';
 
 /**
  * The AICC API class
  */
-class AICC extends Scorm12API {
+export default class AICC extends Scorm12API {
   /**
    * Constructor to create AICC API object
    */
   constructor() {
     super();
 
+    this.cmi = new CMI(this);
     this.nav = new NAV(this);
   }
 
diff --git a/src/BaseAPI.js b/src/BaseAPI.js
index 73a443c..5cedf11 100644
--- a/src/BaseAPI.js
+++ b/src/BaseAPI.js
@@ -389,7 +389,6 @@ export default class BaseAPI {
    * @param {string} CMIElement
    * @param {*} value
    * @return {string}
-   * @private
    */
   _commonSetCMIValue(
       methodName: String, scorm2004: boolean, CMIElement, value) {
diff --git a/src/Scorm12API.js b/src/Scorm12API.js
index 01554ac..cb2c2e0 100644
--- a/src/Scorm12API.js
+++ b/src/Scorm12API.js
@@ -13,7 +13,6 @@ import {scorm12_error_codes} from './constants/error_codes';
 import {scorm12_regex} from './regex';
 
 const constants = scorm12_constants;
-let _self;
 
 /**
  * API class for SCORM 1.2
@@ -24,18 +23,17 @@ export default class Scorm12API extends BaseAPI {
    */
   constructor() {
     super(scorm12_error_codes);
-    _self = this;
 
-    _self.cmi = new CMI(this);
+    this.cmi = new CMI(this);
     // Rename functions to match 1.2 Spec and expose to modules
-    _self.LMSInitialize = _self.lmsInitialize;
-    _self.LMSFinish = _self.lmsFinish;
-    _self.LMSGetValue = _self.lmsGetValue;
-    _self.LMSSetValue = _self.lmsSetValue;
-    _self.LMSCommit = _self.lmsCommit;
-    _self.LMSGetLastError = _self.lmsGetLastError;
-    _self.LMSGetErrorString = _self.lmsGetErrorString;
-    _self.LMSGetDiagnostic = _self.lmsGetDiagnostic;
+    this.LMSInitialize = this.lmsInitialize;
+    this.LMSFinish = this.lmsFinish;
+    this.LMSGetValue = this.lmsGetValue;
+    this.LMSSetValue = this.lmsSetValue;
+    this.LMSCommit = this.lmsCommit;
+    this.LMSGetLastError = this.lmsGetLastError;
+    this.LMSGetErrorString = this.lmsGetErrorString;
+    this.LMSGetDiagnostic = this.lmsGetDiagnostic;
   }
 
   /**
@@ -44,7 +42,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string} bool
    */
   lmsInitialize() {
-    return _self.initialize('LMSInitialize', 'LMS was already initialized!',
+    return this.initialize('LMSInitialize', 'LMS was already initialized!',
         'LMS is already finished!');
   }
 
@@ -54,7 +52,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string} bool
    */
   lmsFinish() {
-    return _self.terminate('LMSFinish', false);
+    return this.terminate('LMSFinish', false);
   }
 
   /**
@@ -64,7 +62,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string}
    */
   lmsGetValue(CMIElement) {
-    return _self.getValue('LMSGetValue', false, CMIElement);
+    return this.getValue('LMSGetValue', false, CMIElement);
   }
 
   /**
@@ -75,7 +73,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string}
    */
   lmsSetValue(CMIElement, value) {
-    return _self.setValue('LMSSetValue', false, CMIElement, value);
+    return this.setValue('LMSSetValue', false, CMIElement, value);
   }
 
   /**
@@ -84,7 +82,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string} bool
    */
   lmsCommit() {
-    return _self.commit('LMSCommit', false);
+    return this.commit('LMSCommit', false);
   }
 
   /**
@@ -93,7 +91,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string}
    */
   lmsGetLastError() {
-    return _self.getLastError('LMSGetLastError');
+    return this.getLastError('LMSGetLastError');
   }
 
   /**
@@ -103,7 +101,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string}
    */
   lmsGetErrorString(CMIErrorCode) {
-    return _self.getErrorString('LMSGetErrorString', CMIErrorCode);
+    return this.getErrorString('LMSGetErrorString', CMIErrorCode);
   }
 
   /**
@@ -113,7 +111,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {string}
    */
   lmsGetDiagnostic(CMIErrorCode) {
-    return _self.getDiagnostic('LMSGetDiagnostic', CMIErrorCode);
+    return this.getDiagnostic('LMSGetDiagnostic', CMIErrorCode);
   }
 
   /**
@@ -123,7 +121,7 @@ export default class Scorm12API extends BaseAPI {
    * @param {*} value
    */
   setCMIValue(CMIElement, value) {
-    _self._commonSetCMIValue('LMSSetValue', false, CMIElement, value);
+    this._commonSetCMIValue('LMSSetValue', false, CMIElement, value);
   }
 
   /**
@@ -133,7 +131,7 @@ export default class Scorm12API extends BaseAPI {
    * @return {*}
    */
   getCMIValue(CMIElement) {
-    return _self._commonGetCMIValue('getCMIValue', false, CMIElement);
+    return this._commonGetCMIValue('getCMIValue', false, CMIElement);
   }
 
   /**
@@ -146,13 +144,13 @@ export default class Scorm12API extends BaseAPI {
   getChildElement(CMIElement, value) {
     let newChild;
 
-    if (_self.stringContains(CMIElement, 'cmi.objectives')) {
+    if (this.stringContains(CMIElement, 'cmi.objectives')) {
       newChild = new CMIObjectivesObject(this);
-    } else if (_self.stringContains(CMIElement, '.correct_responses')) {
+    } else if (this.stringContains(CMIElement, '.correct_responses')) {
       newChild = new CMIInteractionsCorrectResponsesObject(this);
-    } else if (_self.stringContains(CMIElement, '.objectives')) {
+    } else if (this.stringContains(CMIElement, '.objectives')) {
       newChild = new CMIInteractionsObjectivesObject(this);
-    } else if (_self.stringContains(CMIElement, 'cmi.interactions')) {
+    } else if (this.stringContains(CMIElement, 'cmi.interactions')) {
       newChild = new CMIInteractionsObject(this);
     }
 
@@ -199,8 +197,8 @@ export default class Scorm12API extends BaseAPI {
   getCurrentTotalTime() {
     const timeRegex = new RegExp(scorm12_regex.CMITime);
 
-    const totalTime = _self.cmi.core.total_time;
-    const sessionTime = _self.cmi.core.session_time;
+    const totalTime = this.cmi.core.total_time;
+    const sessionTime = this.cmi.core.session_time;
 
     return Utilities.addHHMMSSTimeStrings(totalTime, sessionTime, timeRegex);
   }
@@ -212,6 +210,6 @@ export default class Scorm12API extends BaseAPI {
    */
   replaceWithAnotherScormAPI(newAPI) {
     // Data Model
-    _self.cmi = newAPI.cmi;
+    this.cmi = newAPI.cmi;
   }
 }
diff --git a/src/cmi/aicc_cmi.js b/src/cmi/aicc_cmi.js
index 726dfda..f090e3f 100644
--- a/src/cmi/aicc_cmi.js
+++ b/src/cmi/aicc_cmi.js
@@ -1,7 +1,8 @@
 import * as Scorm12CMI from './scorm12_cmi';
 import {BaseCMI, CMIArray, CMIScore} from './common';
-import {aicc_constants, scorm12_error_codes} from '../constants/api_constants';
+import {aicc_constants} from '../constants/api_constants';
 import {aicc_regex} from '../regex';
+import {scorm12_error_codes} from '../constants/error_codes';
 
 const constants = aicc_constants;
 const regex = aicc_regex;
@@ -23,8 +24,9 @@ export class CMI extends Scorm12CMI.CMI {
    * @param {AICC} API
    */
   constructor(API) {
-    super(API, constants.cmi_children, new AICCCMIStudentData(API));
+    super(API, constants.cmi_children);
 
+    this.student_data = new AICCCMIStudentData(API);
     this.evaluation = new CMIEvaluation(API);
   }
 }
@@ -40,16 +42,21 @@ class CMIEvaluation extends BaseCMI {
   constructor(API) {
     super(API);
 
-    this.comments = new class extends CMIArray {
-      /**
-       * Constructor for AICC Evaluation Comments object
-       * @param {AICC} API
-       */
-      constructor(API) {
-        super(API, constants.comments_children,
-            scorm12_error_codes.INVALID_SET_VALUE);
-      }
-    }(API);
+    this.comments = new CMIEvaluationComments(API);
+  }
+}
+
+/**
+ * Class representing AICC's cmi.evaluation.comments object
+ */
+class CMIEvaluationComments extends CMIArray {
+  /**
+   * Constructor for AICC Evaluation Comments object
+   * @param {AICC} API
+   */
+  constructor(API) {
+    super(API, constants.comments_children,
+        scorm12_error_codes.INVALID_SET_VALUE);
   }
 }
 
@@ -64,15 +71,7 @@ class AICCCMIStudentData extends Scorm12CMI.CMIStudentData {
   constructor(API) {
     super(API, constants.student_data_children);
 
-    this.tries = new class extends CMIArray {
-      /**
-       * Constructor for inline Tries Array class
-       * @param {AICC} API
-       */
-      constructor(API) {
-        super(API, aicc_constants.tries_children);
-      }
-    }(API);
+    this.tries = new CMITries(API);
   }
 
   #tries_during_lesson = '';
@@ -93,7 +92,20 @@ class AICCCMIStudentData extends Scorm12CMI.CMIStudentData {
   set tries_during_lesson(tries_during_lesson) {
     this.API.isNotInitialized() ?
         this.#tries_during_lesson = tries_during_lesson :
-        throwReadOnlyError();
+        throwReadOnlyError(this.API);
+  }
+}
+
+/**
+ * Class representing the AICC cmi.student_data.tries object
+ */
+export class CMITries extends CMIArray {
+  /**
+   * Constructor for inline Tries Array class
+   * @param {AICC} API
+   */
+  constructor(API) {
+    super(API, aicc_constants.tries_children);
   }
 }
 
diff --git a/test/cmi/aicc_cmi.spec.js b/test/cmi/aicc_cmi.spec.js
new file mode 100644
index 0000000..0975e8f
--- /dev/null
+++ b/test/cmi/aicc_cmi.spec.js
@@ -0,0 +1,670 @@
+import {expect, assert} from 'chai';
+import {describe, it, beforeEach, afterEach} from 'mocha';
+import AICC from '../../src/AICC';
+import {aicc_constants} from '../../src/constants/api_constants';
+import {scorm12_error_codes} from '../../src/constants/error_codes';
+
+let API;
+
+const checkFieldConstraintSize = ({fieldName, limit, expectedValue = ''}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should be able to read from ${fieldName}`, () => {
+      expect(eval(`API.${fieldName}`)).to.equal(expectedValue);
+    });
+
+    it(`Should be able to write upto ${limit} characters to ${fieldName}`,
+        () => {
+          eval(`API.${fieldName} = 'x'.repeat(${limit})`);
+          expect(0).to.equal(API.lastErrorCode);
+        });
+
+    it(`Should fail to write more than ${limit} characters to ${fieldName}`,
+        () => {
+          eval(`API.${fieldName} = 'x'.repeat(${limit + 1})`);
+          expect(scorm12_error_codes.TYPE_MISMATCH + '').
+              to.
+              equal(API.lastErrorCode);
+        });
+  });
+};
+
+const checkInvalidSet = ({fieldName, expectedValue = ''}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should be able to read from ${fieldName}`, () => {
+      expect(eval(`API.${fieldName}`)).to.equal(expectedValue);
+    });
+
+    it(`Should fail to write to ${fieldName}`, () => {
+      eval(`API.${fieldName} = 'xxx'`);
+      expect(API.lastErrorCode).
+          to.
+          equal(scorm12_error_codes.INVALID_SET_VALUE + '');
+    });
+  });
+};
+
+const checkReadOnly = ({fieldName, expectedValue = ''}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should be able to read from ${fieldName}`, () => {
+      expect(eval(`API.${fieldName}`)).to.equal(expectedValue);
+    });
+
+    it(`Should fail to write to ${fieldName}`, () => {
+      eval(`API.${fieldName} = 'xxx'`);
+      expect(API.lastErrorCode).
+          to.
+          equal(scorm12_error_codes.READ_ONLY_ELEMENT + '');
+    });
+  });
+};
+
+const checkRead = ({fieldName, expectedValue = ''}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should be able to read from ${fieldName}`, () => {
+      expect(eval(`API.${fieldName}`)).to.equal(expectedValue);
+    });
+  });
+};
+
+const checkReadAndWrite = ({fieldName, expectedValue = '', valueToTest = 'xxx'}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should be able to read from ${fieldName}`, () => {
+      expect(eval(`API.${fieldName}`)).to.equal(expectedValue);
+    });
+
+    it(`Should successfully write to ${fieldName}`, () => {
+      eval(`API.${fieldName} = '${valueToTest}'`);
+      expect(API.lastErrorCode).to.equal(0);
+    });
+  });
+};
+
+const checkWriteOnly = ({fieldName, valueToTest = 'xxx'}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should fail to read from ${fieldName}`, () => {
+      eval(`API.${fieldName}`);
+      expect(API.lastErrorCode).
+          to.
+          equal(scorm12_error_codes.WRITE_ONLY_ELEMENT + '');
+    });
+
+    it(`Should successfully write to ${fieldName}`, () => {
+      eval(`API.${fieldName} = '${valueToTest}'`);
+      expect(API.lastErrorCode).to.equal(0);
+    });
+  });
+};
+
+const checkWrite = ({fieldName, valueToTest = 'xxx'}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should successfully write to ${fieldName}`, () => {
+      eval(`API.${fieldName} = '${valueToTest}'`);
+      expect(API.lastErrorCode).to.equal(0);
+    });
+  });
+};
+
+const checkValidValues = ({fieldName, expectedError, validValues, invalidValues}) => {
+  describe(`Field: ${fieldName}`, () => {
+    for (const idx in validValues) {
+      if ({}.hasOwnProperty.call(validValues, idx)) {
+        it(`Should successfully write '${validValues[idx]}' to ${fieldName}`,
+            () => {
+              eval(`API.${fieldName} = '${validValues[idx]}'`);
+              expect(API.lastErrorCode).to.equal(0);
+            });
+      }
+    }
+
+    for (const idx in invalidValues) {
+      if ({}.hasOwnProperty.call(invalidValues, idx)) {
+        it(`Should fail to write '${invalidValues[idx]}' to ${fieldName}`,
+            () => {
+              eval(`API.${fieldName} = '${invalidValues[idx]}'`);
+              expect(API.lastErrorCode).to.equal(expectedError + '');
+            });
+      }
+    }
+  });
+};
+
+describe('AICC CMI Tests', () => {
+  describe('CMI Spec Tests', () => {
+    beforeEach('Create the API object', () => {
+      API = new AICC();
+      API.lmsInitialize();
+    });
+    afterEach('Destroy API object', () => {
+      API = null;
+    });
+
+    it('lmsInitialize should create CMI object', () => {
+      assert(API.cmi !== undefined, 'CMI object is created');
+    });
+
+    it('Exporting CMI to JSON produces proper Object', () => {
+      expect(
+          JSON.parse(API.renderCMIToJSON()).cmi?.core !== undefined,
+      ).to.be.true;
+    });
+
+    describe('Pre-Initialize Tests', () => {
+      beforeEach('Create the API object', () => {
+        API = new AICC();
+      });
+      afterEach('Destroy API object', () => {
+        API = null;
+      });
+
+      /**
+       * Base CMI Properties
+       */
+      checkInvalidSet({fieldName: 'cmi._version', expectedValue: '3.4'});
+      checkInvalidSet({
+        fieldName: 'cmi._children',
+        expectedValue: aicc_constants.cmi_children,
+      });
+      checkFieldConstraintSize({fieldName: 'cmi.suspend_data', limit: 4096});
+      checkReadAndWrite({fieldName: 'cmi.launch_data'});
+      checkFieldConstraintSize({fieldName: 'cmi.comments', limit: 4096});
+      checkReadAndWrite({fieldName: 'cmi.comments_from_lms'});
+
+      /**
+       * cmi.core Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.core._children',
+        expectedValue: aicc_constants.core_children,
+      });
+      checkReadAndWrite({fieldName: 'cmi.core.student_id'});
+      checkReadAndWrite({fieldName: 'cmi.core.student_name'});
+      checkFieldConstraintSize({
+        fieldName: 'cmi.core.lesson_location',
+        limit: 255,
+      });
+      checkReadAndWrite({fieldName: 'cmi.core.credit'});
+      checkRead({fieldName: 'cmi.core.lesson_status'});
+      checkValidValues({
+        fieldName: 'cmi.core.lesson_status',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          'passed',
+          'completed',
+          'failed',
+          'incomplete',
+          'browsed',
+        ],
+        invalidValues: [
+          'Passed',
+          'P',
+          'F',
+          'p',
+          'true',
+          'false',
+          'complete',
+        ],
+      });
+      checkReadAndWrite({fieldName: 'cmi.core.entry'});
+      checkReadAndWrite({fieldName: 'cmi.core.total_time'});
+      checkReadAndWrite(
+          {fieldName: 'cmi.core.lesson_mode', expectedValue: 'normal'});
+      checkWrite({fieldName: 'cmi.core.exit', valueToTest: 'suspend'});
+      checkValidValues({
+        fieldName: 'cmi.core.exit',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          'time-out',
+          'suspend',
+          'logout',
+        ], invalidValues: [
+          'complete',
+          'exit',
+        ],
+      });
+      checkWriteOnly({
+        fieldName: 'cmi.core.session_time',
+        valueToTest: '00:00:00',
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.session_time',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '10:06:57',
+          '00:00:01.56',
+          '23:59:59',
+          '47:59:59',
+        ],
+        invalidValues: [
+          '06:5:13',
+          '23:59:59.123',
+          'P1DT23H59M59S',
+        ],
+      });
+
+      /**
+       * cmi.core.score Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.core.score._children',
+        expectedValue: aicc_constants.score_children,
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.raw',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.min',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.max',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+
+      /**
+       * cmi.objectives Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.objectives._children',
+        expectedValue: aicc_constants.objectives_children,
+      });
+      checkInvalidSet({fieldName: 'cmi.objectives._count', expectedValue: 0});
+
+      /**
+       * cmi.student_data Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.student_data._children',
+        expectedValue: aicc_constants.student_data_children,
+      });
+      checkReadAndWrite({fieldName: 'cmi.student_data.mastery_score'});
+      checkReadAndWrite({fieldName: 'cmi.student_data.max_time_allowed'});
+      checkReadAndWrite({fieldName: 'cmi.student_data.time_limit_action'});
+      checkReadAndWrite({fieldName: 'cmi.student_data.tries_during_lesson'});
+
+      /**
+       * cmi.student_preference Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.student_preference._children',
+        expectedValue: aicc_constants.student_preference_children,
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.audio',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-1',
+          '50',
+          '100',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.audio',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '101',
+          '5000000',
+          '-500',
+        ],
+      });
+      checkFieldConstraintSize({
+        fieldName: 'cmi.student_preference.language',
+        limit: 255,
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.speed',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-100',
+          '50',
+          '100',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.speed',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '101',
+          '-101',
+          '5000000',
+          '-500',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.text',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-1',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.text',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '2',
+          '-2',
+        ],
+      });
+
+      /**
+       * cmi.interactions Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.interactions._children',
+        expectedValue: aicc_constants.interactions_children,
+      });
+      checkInvalidSet({fieldName: 'cmi.interactions._count', expectedValue: 0});
+    });
+
+    describe('Post-Initialize Tests', () => {
+      beforeEach('Create the API object', () => {
+        API = new AICC();
+        API.lmsInitialize();
+      });
+      afterEach('Destroy API object', () => {
+        API = null;
+      });
+
+      /**
+       * Base CMI Properties
+       */
+      checkInvalidSet({fieldName: 'cmi._version', expectedValue: '3.4'});
+      checkInvalidSet({
+        fieldName: 'cmi._children',
+        expectedValue: aicc_constants.cmi_children,
+      });
+      checkFieldConstraintSize({fieldName: 'cmi.suspend_data', limit: 4096});
+      checkReadOnly({fieldName: 'cmi.launch_data'});
+      checkFieldConstraintSize({fieldName: 'cmi.comments', limit: 4096});
+      checkReadOnly({fieldName: 'cmi.comments_from_lms'});
+
+      /**
+       * cmi.core Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.core._children',
+        expectedValue: aicc_constants.core_children,
+      });
+      checkReadOnly({fieldName: 'cmi.core.student_id'});
+      checkReadOnly({fieldName: 'cmi.core.student_name'});
+      checkFieldConstraintSize({
+        fieldName: 'cmi.core.lesson_location',
+        limit: 255,
+      });
+      checkReadOnly({fieldName: 'cmi.core.credit'});
+      checkRead({fieldName: 'cmi.core.lesson_status'});
+      checkValidValues({
+        fieldName: 'cmi.core.lesson_status',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          'passed',
+          'completed',
+          'failed',
+          'incomplete',
+          'browsed',
+        ],
+        invalidValues: [
+          'Passed',
+          'P',
+          'F',
+          'p',
+          'true',
+          'false',
+          'complete',
+        ],
+      });
+      checkReadOnly({fieldName: 'cmi.core.entry'});
+      checkReadOnly({fieldName: 'cmi.core.total_time'});
+      checkReadOnly(
+          {fieldName: 'cmi.core.lesson_mode', expectedValue: 'normal'});
+      checkWrite({fieldName: 'cmi.core.exit', valueToTest: 'suspend'});
+      checkValidValues({
+        fieldName: 'cmi.core.exit',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          'time-out',
+          'suspend',
+          'logout',
+        ], invalidValues: [
+          'complete',
+          'exit',
+        ],
+      });
+      checkWriteOnly({
+        fieldName: 'cmi.core.session_time',
+        valueToTest: '00:00:00',
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.session_time',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '10:06:57',
+          '00:00:01.56',
+          '23:59:59',
+          '47:59:59',
+        ],
+        invalidValues: [
+          '06:5:13',
+          '23:59:59.123',
+          'P1DT23H59M59S',
+        ],
+      });
+
+      /**
+       * cmi.core.score Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.core.score._children',
+        expectedValue: aicc_constants.score_children,
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.raw',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.min',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.max',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+
+      /**
+       * cmi.objectives Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.objectives._children',
+        expectedValue: aicc_constants.objectives_children,
+      });
+      checkInvalidSet({fieldName: 'cmi.objectives._count', expectedValue: 0});
+
+      /**
+       * cmi.student_data Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.student_data._children',
+        expectedValue: aicc_constants.student_data_children,
+      });
+      checkReadOnly({fieldName: 'cmi.student_data.mastery_score'});
+      checkReadOnly({fieldName: 'cmi.student_data.max_time_allowed'});
+      checkReadOnly({fieldName: 'cmi.student_data.time_limit_action'});
+      checkReadOnly({fieldName: 'cmi.student_data.tries_during_lesson'});
+
+      /**
+       * cmi.student_preference Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.student_preference._children',
+        expectedValue: aicc_constants.student_preference_children,
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.audio',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-1',
+          '50',
+          '100',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.audio',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '101',
+          '5000000',
+          '-500',
+        ],
+      });
+      checkFieldConstraintSize({
+        fieldName: 'cmi.student_preference.language',
+        limit: 255,
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.speed',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-100',
+          '50',
+          '100',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.speed',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '101',
+          '-101',
+          '5000000',
+          '-500',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.text',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-1',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.text',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '2',
+          '-2',
+        ],
+      });
+
+      /**
+       * cmi.interactions Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.interactions._children',
+        expectedValue: aicc_constants.interactions_children,
+      });
+      checkInvalidSet({fieldName: 'cmi.interactions._count', expectedValue: 0});
+    });
+  });
+});
diff --git a/test/cmi/scorm12_cmi.spec.js b/test/cmi/scorm12_cmi.spec.js
index 951e75e..bb73333 100644
--- a/test/cmi/scorm12_cmi.spec.js
+++ b/test/cmi/scorm12_cmi.spec.js
@@ -66,6 +66,19 @@ const checkRead = ({fieldName, expectedValue = ''}) => {
   });
 };
 
+const checkReadAndWrite = ({fieldName, expectedValue = '', valueToTest = 'xxx'}) => {
+  describe(`Field: ${fieldName}`, () => {
+    it(`Should be able to read from ${fieldName}`, () => {
+      expect(eval(`API.${fieldName}`)).to.equal(expectedValue);
+    });
+
+    it(`Should successfully write to ${fieldName}`, () => {
+      eval(`API.${fieldName} = '${valueToTest}'`);
+      expect(API.lastErrorCode).to.equal(0);
+    });
+  });
+};
+
 const checkWriteOnly = ({fieldName, valueToTest = 'xxx'}) => {
   describe(`Field: ${fieldName}`, () => {
     it(`Should fail to read from ${fieldName}`, () => {
@@ -115,9 +128,285 @@ const checkValidValues = ({fieldName, expectedError, validValues, invalidValues}
   });
 };
 
-describe('SCORM 1.2 API Tests', () => {
+describe('SCORM 1.2 CMI Tests', () => {
   describe('CMI Spec Tests', () => {
-    describe('Post-lmsInitialize Tests', () => {
+    beforeEach('Create the API object', () => {
+      API = new Scorm12API();
+      API.lmsInitialize();
+    });
+    afterEach('Destroy API object', () => {
+      API = null;
+    });
+
+    it('lmsInitialize should create CMI object', () => {
+      assert(API.cmi !== undefined, 'CMI object is created');
+    });
+
+    it('Exporting CMI to JSON produces proper Object', () => {
+      expect(
+          JSON.parse(API.renderCMIToJSON()).cmi?.core !== undefined,
+      ).to.be.true;
+    });
+
+    describe('Pre-Initialize Tests', () => {
+      beforeEach('Create the API object', () => {
+        API = new Scorm12API();
+      });
+      afterEach('Destroy API object', () => {
+        API = null;
+      });
+
+      /**
+       * Base CMI Properties
+       */
+      checkInvalidSet({fieldName: 'cmi._version', expectedValue: '3.4'});
+      checkInvalidSet({
+        fieldName: 'cmi._children',
+        expectedValue: scorm12_constants.cmi_children,
+      });
+      checkFieldConstraintSize({fieldName: 'cmi.suspend_data', limit: 4096});
+      checkReadAndWrite({fieldName: 'cmi.launch_data'});
+      checkFieldConstraintSize({fieldName: 'cmi.comments', limit: 4096});
+      checkReadAndWrite({fieldName: 'cmi.comments_from_lms'});
+
+      /**
+       * cmi.core Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.core._children',
+        expectedValue: scorm12_constants.core_children,
+      });
+      checkReadAndWrite({fieldName: 'cmi.core.student_id'});
+      checkReadAndWrite({fieldName: 'cmi.core.student_name'});
+      checkFieldConstraintSize({
+        fieldName: 'cmi.core.lesson_location',
+        limit: 255,
+      });
+      checkReadAndWrite({fieldName: 'cmi.core.credit'});
+      checkRead({fieldName: 'cmi.core.lesson_status'});
+      checkValidValues({
+        fieldName: 'cmi.core.lesson_status',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          'passed',
+          'completed',
+          'failed',
+          'incomplete',
+          'browsed',
+        ],
+        invalidValues: [
+          'Passed',
+          'P',
+          'F',
+          'p',
+          'true',
+          'false',
+          'complete',
+        ],
+      });
+      checkReadAndWrite({fieldName: 'cmi.core.entry'});
+      checkReadAndWrite({fieldName: 'cmi.core.total_time'});
+      checkReadAndWrite(
+          {fieldName: 'cmi.core.lesson_mode', expectedValue: 'normal'});
+      checkWrite({fieldName: 'cmi.core.exit', valueToTest: 'suspend'});
+      checkValidValues({
+        fieldName: 'cmi.core.exit',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          'time-out',
+          'suspend',
+          'logout',
+        ], invalidValues: [
+          'complete',
+          'exit',
+        ],
+      });
+      checkWriteOnly({
+        fieldName: 'cmi.core.session_time',
+        valueToTest: '00:00:00',
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.session_time',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '10:06:57',
+          '00:00:01.56',
+          '23:59:59',
+          '47:59:59',
+        ],
+        invalidValues: [
+          '06:5:13',
+          '23:59:59.123',
+          'P1DT23H59M59S',
+        ],
+      });
+
+      /**
+       * cmi.core.score Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.core.score._children',
+        expectedValue: scorm12_constants.score_children,
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.raw',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.min',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.core.score.max',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [
+          '0',
+          '25.1',
+          '50.5',
+          '75',
+          '100',
+        ],
+        invalidValues: [
+          '-1',
+          '101',
+        ],
+      });
+
+      /**
+       * cmi.objectives Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.objectives._children',
+        expectedValue: scorm12_constants.objectives_children,
+      });
+      checkInvalidSet({fieldName: 'cmi.objectives._count', expectedValue: 0});
+
+      /**
+       * cmi.student_data Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.student_data._children',
+        expectedValue: scorm12_constants.student_data_children,
+      });
+      checkReadAndWrite({fieldName: 'cmi.student_data.mastery_score'});
+      checkReadAndWrite({fieldName: 'cmi.student_data.max_time_allowed'});
+      checkReadAndWrite({fieldName: 'cmi.student_data.time_limit_action'});
+
+      /**
+       * cmi.student_preference Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.student_preference._children',
+        expectedValue: scorm12_constants.student_preference_children,
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.audio',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-1',
+          '50',
+          '100',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.audio',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '101',
+          '5000000',
+          '-500',
+        ],
+      });
+      checkFieldConstraintSize({
+        fieldName: 'cmi.student_preference.language',
+        limit: 255,
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.speed',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-100',
+          '50',
+          '100',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.speed',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '101',
+          '-101',
+          '5000000',
+          '-500',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.text',
+        expectedError: scorm12_error_codes.TYPE_MISMATCH,
+        validValues: [
+          '1',
+          '-1',
+        ],
+        invalidValues: [
+          'invalid',
+          'a100',
+        ],
+      });
+      checkValidValues({
+        fieldName: 'cmi.student_preference.text',
+        expectedError: scorm12_error_codes.VALUE_OUT_OF_RANGE,
+        validValues: [],
+        invalidValues: [
+          '2',
+          '-2',
+        ],
+      });
+
+      /**
+       * cmi.interactions Properties
+       */
+      checkInvalidSet({
+        fieldName: 'cmi.interactions._children',
+        expectedValue: scorm12_constants.interactions_children,
+      });
+      checkInvalidSet({fieldName: 'cmi.interactions._count', expectedValue: 0});
+    });
+
+    describe('Post-Initialize Tests', () => {
       beforeEach('Create the API object', () => {
         API = new Scorm12API();
         API.lmsInitialize();
@@ -126,16 +415,6 @@ describe('SCORM 1.2 API Tests', () => {
         API = null;
       });
 
-      it('lmsInitialize should create CMI object', () => {
-        assert(API.cmi !== undefined, 'CMI object is created');
-      });
-
-      it('Exporting CMI to JSON produces proper Object', () => {
-        expect(
-            JSON.parse(API.renderCMIToJSON()).cmi?.core !== undefined,
-        ).to.be.true;
-      });
-
       /**
        * Base CMI Properties
        */