diff --git a/modules/angular2/src/core/change_detection.ts b/modules/angular2/src/core/change_detection.ts
index b131dcfb6685..47b7c7812f45 100644
--- a/modules/angular2/src/core/change_detection.ts
+++ b/modules/angular2/src/core/change_detection.ts
@@ -15,6 +15,7 @@ export {
   ChangeDetectorRef,
 
   WrappedValue,
+  SimpleChange,
   PipeTransform,
   PipeOnDestroy,
   IterableDiffers,
@@ -23,5 +24,4 @@ export {
   KeyValueDiffers,
   KeyValueDiffer,
   KeyValueDifferFactory
-
 } from './change_detection/change_detection';
diff --git a/modules/angular2/src/core/change_detection/change_detection.ts b/modules/angular2/src/core/change_detection/change_detection.ts
index 27336b5c0cec..594711730cf4 100644
--- a/modules/angular2/src/core/change_detection/change_detection.ts
+++ b/modules/angular2/src/core/change_detection/change_detection.ts
@@ -51,7 +51,7 @@ export {ChangeDetectorRef} from './change_detector_ref';
 export {IterableDiffers, IterableDiffer, IterableDifferFactory} from './differs/iterable_differs';
 export {KeyValueDiffers, KeyValueDiffer, KeyValueDifferFactory} from './differs/keyvalue_differs';
 export {PipeTransform, PipeOnDestroy} from './pipe_transform';
-export {WrappedValue} from './change_detection_util';
+export {WrappedValue, SimpleChange} from './change_detection_util';
 
 /**
  * Structural diffing for `Object`s and `Map`s.
diff --git a/modules/angular2/src/core/compiler/interfaces.ts b/modules/angular2/src/core/compiler/interfaces.ts
index 141e483c333c..7c26874790ed 100644
--- a/modules/angular2/src/core/compiler/interfaces.ts
+++ b/modules/angular2/src/core/compiler/interfaces.ts
@@ -1,4 +1,5 @@
 import {StringMap, MapWrapper} from 'angular2/src/core/facade/collection';
+import {SimpleChange} from 'angular2/src/core/change_detection/change_detection_util';
 
 export enum LifecycleHooks {
   OnInit,
@@ -60,7 +61,7 @@ export var LIFECYCLE_HOOKS_VALUES = [
  * }
  *  ```
  */
-export interface OnChanges { onChanges(changes: StringMap<string, any>); }
+export interface OnChanges { onChanges(changes: StringMap<string, SimpleChange>); }
 
 /**
  * Notify a directive when it has been checked the first time.
diff --git a/modules/angular2/src/core/forms/directives/ng_control_name.ts b/modules/angular2/src/core/forms/directives/ng_control_name.ts
index ccd39258d9f3..fa6ed854fede 100644
--- a/modules/angular2/src/core/forms/directives/ng_control_name.ts
+++ b/modules/angular2/src/core/forms/directives/ng_control_name.ts
@@ -2,6 +2,7 @@ import {CONST_EXPR} from 'angular2/src/core/facade/lang';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/core/facade/async';
 import {StringMap} from 'angular2/src/core/facade/collection';
 import {OnChanges, OnDestroy} from 'angular2/lifecycle_hooks';
+import {SimpleChange} from 'angular2/src/core/change_detection';
 import {Query, Directive} from 'angular2/src/core/metadata';
 import {forwardRef, Host, SkipSelf, Binding, Inject, Optional} from 'angular2/src/core/di';
 
@@ -93,7 +94,7 @@ export class NgControlName extends NgControl implements OnChanges,
     this.validators = validators;
   }
 
-  onChanges(changes: StringMap<string, any>) {
+  onChanges(changes: StringMap<string, SimpleChange>) {
     if (!this._added) {
       this.formDirective.addControl(this);
       this._added = true;
diff --git a/modules/angular2/src/core/forms/directives/ng_form_control.ts b/modules/angular2/src/core/forms/directives/ng_form_control.ts
index ee67f7b12800..92d7318b0f58 100644
--- a/modules/angular2/src/core/forms/directives/ng_form_control.ts
+++ b/modules/angular2/src/core/forms/directives/ng_form_control.ts
@@ -1,6 +1,7 @@
 import {CONST_EXPR} from 'angular2/src/core/facade/lang';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/core/facade/async';
 import {OnChanges} from 'angular2/lifecycle_hooks';
+import {SimpleChange} from 'angular2/src/core/change_detection';
 import {Query, Directive} from 'angular2/src/core/metadata';
 import {forwardRef, Binding, Inject, Optional} from 'angular2/src/core/di';
 import {NgControl} from './ng_control';
@@ -66,7 +67,7 @@ export class NgFormControl extends NgControl implements OnChanges {
     this.validators = validators;
   }
 
-  onChanges(changes: StringMap<string, any>): void {
+  onChanges(changes: StringMap<string, SimpleChange>): void {
     if (!this._added) {
       setUpControl(this.form, this);
       this.form.updateValidity();
diff --git a/modules/angular2/src/core/forms/directives/ng_model.ts b/modules/angular2/src/core/forms/directives/ng_model.ts
index 3e125798e222..510933605367 100644
--- a/modules/angular2/src/core/forms/directives/ng_model.ts
+++ b/modules/angular2/src/core/forms/directives/ng_model.ts
@@ -1,8 +1,7 @@
 import {CONST_EXPR} from 'angular2/src/core/facade/lang';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/core/facade/async';
-
 import {OnChanges} from 'angular2/lifecycle_hooks';
-
+import {SimpleChange} from 'angular2/src/core/change_detection';
 import {Query, Directive} from 'angular2/src/core/metadata';
 import {forwardRef, Binding, Inject, Optional} from 'angular2/src/core/di';
 import {NgControl} from './ng_control';
@@ -47,7 +46,7 @@ export class NgModel extends NgControl implements OnChanges {
     this.validators = validators;
   }
 
-  onChanges(changes: StringMap<string, any>) {
+  onChanges(changes: StringMap<string, SimpleChange>) {
     if (!this._added) {
       setUpControl(this._control, this);
       this._control.updateValidity();
diff --git a/modules/angular2/test/compiler/runtime_metadata_spec.ts b/modules/angular2/test/compiler/runtime_metadata_spec.ts
index b3c3a7077651..bf9621fd5976 100644
--- a/modules/angular2/test/compiler/runtime_metadata_spec.ts
+++ b/modules/angular2/test/compiler/runtime_metadata_spec.ts
@@ -29,7 +29,8 @@ import {
   AfterContentInit,
   AfterContentChecked,
   AfterViewInit,
-  AfterViewChecked
+  AfterViewChecked,
+  SimpleChange
 } from 'angular2/core';
 
 import {TEST_BINDINGS} from './test_bindings';
@@ -114,7 +115,7 @@ class DirectiveWithoutModuleId {
 class ComponentWithEverything implements OnChanges,
     OnInit, DoCheck, OnDestroy, AfterContentInit, AfterContentChecked, AfterViewInit,
     AfterViewChecked {
-  onChanges(changes: StringMap<string, any>): void {}
+  onChanges(changes: StringMap<string, SimpleChange>): void {}
   onInit(): void {}
   doCheck(): void {}
   onDestroy(): void {}
diff --git a/modules/angular2/test/public_api_spec.ts b/modules/angular2/test/public_api_spec.ts
index 23665ca3ac3f..5a54cd909d38 100644
--- a/modules/angular2/test/public_api_spec.ts
+++ b/modules/angular2/test/public_api_spec.ts
@@ -970,6 +970,12 @@ var NG_API = [
   'SlicePipe',
   'SlicePipe.supports()',
   'SlicePipe.transform()',
+  'SimpleChange',
+  'SimpleChange.currentValue',
+  'SimpleChange.currentValue=',
+  'SimpleChange.previousValue',
+  'SimpleChange.previousValue=',
+  'SimpleChange.isFirstChange()',
   'TemplateRef',
   'TemplateRef.elementRef',
   'TemplateRef.elementRef=',