diff --git a/src/components/button/button.ts b/src/components/button/button.ts
index 5ac983f5d94..8f65d161306 100644
--- a/src/components/button/button.ts
+++ b/src/components/button/button.ts
@@ -72,7 +72,7 @@ export class MdButton {
   encapsulation: ViewEncapsulation.None
 })
 export class MdAnchor extends MdButton {
-  disabled_: boolean = null;
+  _disabled: boolean = null;
 
   @HostBinding('tabIndex')
   get tabIndex(): number {
@@ -87,11 +87,11 @@ export class MdAnchor extends MdButton {
 
   @HostBinding('attr.disabled')
   @Input('disabled')
-  get disabled() { return this.disabled_; }
+  get disabled() { return this._disabled; }
 
   set disabled(value: boolean) {
     // The presence of *any* disabled value makes the component disabled, *except* for false.
-    this.disabled_ = (value != null && value != false) ? true : null;
+    this._disabled = (value != null && value != false) ? true : null;
   }
 
   @HostListener('click', ['$event'])
diff --git a/src/components/progress-circle/progress_circle.ts b/src/components/progress-circle/progress_circle.ts
index f9bf4be1fe9..858e08cb17b 100644
--- a/src/components/progress-circle/progress_circle.ts
+++ b/src/components/progress-circle/progress_circle.ts
@@ -38,11 +38,11 @@ export class MdProgressCircle {
    * Value of the progress circle.
    *
    * Input:number, defaults to 0.
-   * value_ is bound to the host as the attribute aria-valuenow.
+   * _value is bound to the host as the attribute aria-valuenow.
    */
   @HostBinding('attr.aria-valuenow')
   @Input('value')
-  value_: number = 0;
+  _value: number = 0;
 
   /**
    * Mode of the progress circle
@@ -69,20 +69,20 @@ export class MdProgressCircle {
 
     // The total circumference is calculated based on the radius we use, 45.
     // PI * 2 * 45
-    return 251.3274 * (100 - this.value_) / 100;
+    return 251.3274 * (100 - this._value) / 100;
   }
 
 
   /** Gets the progress value, returning the clamped value. */
   get value() {
-    return this.value_;
+    return this._value;
   }
 
 
   /** Sets the progress value, clamping before setting the internal value. */
   set value(v: number) {
     if (isPresent(v)) {
-      this.value_ = MdProgressCircle.clamp(v);
+      this._value = MdProgressCircle.clamp(v);
     }
   }
 
diff --git a/src/components/sidenav/sidenav.html b/src/components/sidenav/sidenav.html
index 312314277b3..daad959b38f 100644
--- a/src/components/sidenav/sidenav.html
+++ b/src/components/sidenav/sidenav.html
@@ -1,11 +1,11 @@
-<div class="md-sidenav-backdrop" (click)="closeModalSidenav_()"
-     [class.md-sidenav-shown]="isShowingBackdrop_()"></div>
+<div class="md-sidenav-backdrop" (click)="_closeModalSidenav()"
+     [class.md-sidenav-shown]="_isShowingBackdrop()"></div>
 
 <ng-content select="md-sidenav"></ng-content>
 
-<md-content [style.margin-left.px]="getMarginLeft_()"
-            [style.margin-right.px]="getMarginRight_()"
-            [style.left.px]="getPositionLeft_()"
-            [style.right.px]="getPositionRight_()">
+<md-content [style.margin-left.px]="_getMarginLeft()"
+            [style.margin-right.px]="_getMarginRight()"
+            [style.left.px]="_getPositionLeft()"
+            [style.right.px]="_getPositionRight()">
   <ng-content></ng-content>
 </md-content>
diff --git a/src/components/sidenav/sidenav.spec.ts b/src/components/sidenav/sidenav.spec.ts
index 3f9f53eb9be..0d9ca2045c8 100644
--- a/src/components/sidenav/sidenav.spec.ts
+++ b/src/components/sidenav/sidenav.spec.ts
@@ -55,7 +55,7 @@ function createFixture(builder: TestComponentBuilder,
 function endSidenavTransition(fixture: ComponentFixture) {
   let sidenav: any = fixture.debugElement.query(By.directive(MdSidenav)).componentInstance;
   sidenav.onTransitionEnd({
-    target: (<any>sidenav).elementRef_.nativeElement,
+    target: (<any>sidenav)._elementRef.nativeElement,
     propertyName: 'transform'
   });
   fixture.detectChanges();
diff --git a/src/components/sidenav/sidenav.ts b/src/components/sidenav/sidenav.ts
index 2c78de828f6..7b98c3fd145 100644
--- a/src/components/sidenav/sidenav.ts
+++ b/src/components/sidenav/sidenav.ts
@@ -57,7 +57,7 @@ export class MdSidenav {
   @Input() @OneOf(['over', 'push', 'side']) mode: string = 'over';
 
   /** Whether the sidenav is opened. */
-  @Input('opened') private opened_: boolean;
+  @Input('opened') private _opened: boolean;
 
   /** Event emitted when the sidenav is being opened. Use this to synchronize animations. */
   @Output('open-start') onOpenStart = new EventEmitter<Object>();
@@ -73,16 +73,16 @@ export class MdSidenav {
 
 
   /**
-   * @param elementRef_ The DOM element reference. Used for transition and width calculation.
+   * @param _elementRef The DOM element reference. Used for transition and width calculation.
    *     If not available we do not hook on transitions.
    */
-  constructor(private elementRef_: ElementRef) {}
+  constructor(private _elementRef: ElementRef) {}
 
   /**
    * Whether the sidenav is opened. We overload this because we trigger an event when it
    * starts or end.
    */
-  get opened(): boolean { return this.opened_; }
+  get opened(): boolean { return this._opened; }
   set opened(v: boolean) {
     this.toggle(v);
   }
@@ -113,15 +113,15 @@ export class MdSidenav {
     }
     // Shortcut it if we're already opened.
     if (isOpen === this.opened) {
-      if (!this.transition_) {
+      if (!this._transition) {
         return PromiseWrapper.resolve(null);
       } else {
-        return isOpen ? this.openPromise_ : this.closePromise_;
+        return isOpen ? this._openPromise : this._closePromise;
       }
     }
 
-    this.opened_ = isOpen;
-    this.transition_ = true;
+    this._opened = isOpen;
+    this._transition = true;
 
     if (isOpen) {
       this.onOpenStart.emit(null);
@@ -130,21 +130,21 @@ export class MdSidenav {
     }
 
     if (isOpen) {
-      if (this.openPromise_ == null) {
+      if (this._openPromise == null) {
         let completer = PromiseWrapper.completer();
-        this.openPromise_ = completer.promise;
-        this.openPromiseReject_ = completer.reject;
-        this.openPromiseResolve_ = completer.resolve;
+        this._openPromise = completer.promise;
+        this._openPromiseReject = completer.reject;
+        this._openPromiseResolve = completer.resolve;
       }
-      return this.openPromise_;
+      return this._openPromise;
     } else {
-      if (this.closePromise_ == null) {
+      if (this._closePromise == null) {
         let completer = PromiseWrapper.completer();
-        this.closePromise_ = completer.promise;
-        this.closePromiseReject_ = completer.reject;
-        this.closePromiseResolve_ = completer.resolve;
+        this._closePromise = completer.promise;
+        this._closePromiseReject = completer.reject;
+        this._closePromiseResolve = completer.resolve;
       }
-      return this.closePromise_;
+      return this._closePromise;
     }
   }
 
@@ -157,57 +157,57 @@ export class MdSidenav {
    * @private
    */
   @HostListener('transitionend', ['$event']) onTransitionEnd(e: any) {
-    if (e.target == this.elementRef_.nativeElement
+    if (e.target == this._elementRef.nativeElement
         // Simpler version to check for prefixes.
         && e.propertyName.endsWith('transform')) {
-      this.transition_ = false;
-      if (this.opened_) {
-        if (this.openPromise_ != null) {
-          this.openPromiseResolve_();
+      this._transition = false;
+      if (this._opened) {
+        if (this._openPromise != null) {
+          this._openPromiseResolve();
         }
-        if (this.closePromise_ != null) {
-          this.closePromiseReject_();
+        if (this._closePromise != null) {
+          this._closePromiseReject();
         }
 
         this.onOpen.emit(null);
       } else {
-        if (this.closePromise_ != null) {
-          this.closePromiseResolve_();
+        if (this._closePromise != null) {
+          this._closePromiseResolve();
         }
-        if (this.openPromise_ != null) {
-          this.openPromiseReject_();
+        if (this._openPromise != null) {
+          this._openPromiseReject();
         }
 
         this.onClose.emit(null);
       }
 
-      this.openPromise_ = null;
-      this.closePromise_ = null;
+      this._openPromise = null;
+      this._closePromise = null;
     }
   }
 
-  @HostBinding('class.md-sidenav-closing') private get isClosing_() {
-    return !this.opened_ && this.transition_;
+  @HostBinding('class.md-sidenav-closing') private get _isClosing() {
+    return !this._opened && this._transition;
   }
-  @HostBinding('class.md-sidenav-opening') private get isOpening_() {
-    return this.opened_ && this.transition_;
+  @HostBinding('class.md-sidenav-opening') private get _isOpening() {
+    return this._opened && this._transition;
   }
-  @HostBinding('class.md-sidenav-closed') private get isClosed_() {
-    return !this.opened_ && !this.transition_;
+  @HostBinding('class.md-sidenav-closed') private get _isClosed() {
+    return !this._opened && !this._transition;
   }
-  @HostBinding('class.md-sidenav-opened') private get isOpened_() {
-    return this.opened_ && !this.transition_;
+  @HostBinding('class.md-sidenav-opened') private get _isOpened() {
+    return this._opened && !this._transition;
   }
-  @HostBinding('class.md-sidenav-end') private get isEnd_() {
+  @HostBinding('class.md-sidenav-end') private get _isEnd() {
     return this.align == 'end';
   }
-  @HostBinding('class.md-sidenav-side') private get modeSide_() {
+  @HostBinding('class.md-sidenav-side') private get _modeSide() {
     return this.mode == 'side';
   }
-  @HostBinding('class.md-sidenav-over') private get modeOver_() {
+  @HostBinding('class.md-sidenav-over') private get _modeOver() {
     return this.mode == 'over';
   }
-  @HostBinding('class.md-sidenav-push') private get modePush_() {
+  @HostBinding('class.md-sidenav-push') private get _modePush() {
     return this.mode == 'push';
   }
 
@@ -216,20 +216,20 @@ export class MdSidenav {
    * not be used outside.
    * @private
    */
-  public get width_() {
-    if (this.elementRef_.nativeElement) {
-      return this.elementRef_.nativeElement.offsetWidth;
+  public get _width() {
+    if (this._elementRef.nativeElement) {
+      return this._elementRef.nativeElement.offsetWidth;
     }
     return 0;
   }
 
-  private transition_: boolean = false;
-  private openPromise_: Promise<void>;
-  private openPromiseResolve_: () => void;
-  private openPromiseReject_: () => void;
-  private closePromise_: Promise<void>;
-  private closePromiseResolve_: () => void;
-  private closePromiseReject_: () => void;
+  private _transition: boolean = false;
+  private _openPromise: Promise<void>;
+  private _openPromiseResolve: () => void;
+  private _openPromiseReject: () => void;
+  private _closePromise: Promise<void>;
+  private _closePromiseResolve: () => void;
+  private _closePromiseReject: () => void;
 }
 
 
@@ -255,88 +255,88 @@ export class MdSidenav {
   ],
 })
 export class MdSidenavLayout implements AfterContentInit {
-  @ContentChildren(MdSidenav) private sidenavs_: QueryList<MdSidenav>;
+  @ContentChildren(MdSidenav) private _sidenavs: QueryList<MdSidenav>;
 
-  get start() { return this.start_; }
-  get end() { return this.end_; }
+  get start() { return this._start; }
+  get end() { return this._end; }
 
-  constructor(@Optional() @Host() private dir_: Dir) {
+  constructor(@Optional() @Host() private _dir: Dir) {
     // If a `Dir` directive exists up the tree, listen direction changes and update the left/right
     // properties to point to the proper start/end.
-    if (dir_ != null) {
-      dir_.dirChange.add(() => this.validateDrawers_());
+    if (_dir != null) {
+      _dir.dirChange.add(() => this._validateDrawers());
     }
   }
 
   ngAfterContentInit() {
     // On changes, assert on consistency.
-    ObservableWrapper.subscribe(this.sidenavs_.changes, () => this.validateDrawers_());
-    this.validateDrawers_();
+    ObservableWrapper.subscribe(this._sidenavs.changes, () => this._validateDrawers());
+    this._validateDrawers();
   }
 
 
   /** The sidenav at the start/end alignment, independent of direction. */
-  private start_: MdSidenav;
-  private end_: MdSidenav;
+  private _start: MdSidenav;
+  private _end: MdSidenav;
 
   /**
    * The sidenav at the left/right. When direction changes, these will change as well.
    * They're used as aliases for the above to set the left/right style properly.
-   * In LTR, left_ == start_ and right_ == end_.
-   * In RTL, left_ == end_ and right_ == start_.
+   * In LTR, _left == _start and _right == _end.
+   * In RTL, _left == _end and _right == _start.
    */
-  private left_: MdSidenav;
-  private right_: MdSidenav;
+  private _left: MdSidenav;
+  private _right: MdSidenav;
 
   /**
    * Validate the state of the sidenav children components.
    * @private
    */
-  private validateDrawers_() {
-    this.start_ = this.end_ = null;
-    if (this.sidenavs_.length === 0) {
+  private _validateDrawers() {
+    this._start = this._end = null;
+    if (this._sidenavs.length === 0) {
       throw new MdMissingSidenavException();
     }
 
     // Ensure that we have at most one start and one end sidenav.
-    iterateListLike(this.sidenavs_, (sidenav: any) => {
+    iterateListLike(this._sidenavs, (sidenav: any) => {
       if (sidenav.align == 'end') {
-        if (this.end_ != null) {
+        if (this._end != null) {
           throw new MdDuplicatedSidenavException('end');
         }
-        this.end_ = sidenav;
+        this._end = sidenav;
       } else {
-        if (this.start_ != null) {
+        if (this._start != null) {
           throw new MdDuplicatedSidenavException('start');
         }
-        this.start_ = sidenav;
+        this._start = sidenav;
       }
     });
 
-    this.right_ = this.left_ = null;
+    this._right = this._left = null;
 
     // Detect if we're LTR or RTL.
-    if (this.dir_ == null || this.dir_.value == 'ltr') {
-      this.left_ = this.start_;
-      this.right_ = this.end_;
+    if (this._dir == null || this._dir.value == 'ltr') {
+      this._left = this._start;
+      this._right = this._end;
     } else {
-      this.left_ = this.end_;
-      this.right_ = this.start_;
+      this._left = this._end;
+      this._right = this._start;
     }
   }
 
-  private closeModalSidenav_() {
-    if (this.start_ != null && this.start_.mode != 'side') {
-      this.start_.close();
+  private _closeModalSidenav() {
+    if (this._start != null && this._start.mode != 'side') {
+      this._start.close();
     }
-    if (this.end_ != null && this.end_.mode != 'side') {
-      this.end_.close();
+    if (this._end != null && this._end.mode != 'side') {
+      this._end.close();
     }
   }
 
-  private isShowingBackdrop_() {
-    return (this.start_ != null && this.start_.mode != 'side' && this.start_.opened)
-        || (this.end_ != null && this.end_.mode != 'side' && this.end_.opened);
+  private _isShowingBackdrop() {
+    return (this._start != null && this._start.mode != 'side' && this._start.opened)
+        || (this._end != null && this._end.mode != 'side' && this._end.opened);
   }
 
   /**
@@ -345,27 +345,27 @@ export class MdSidenavLayout implements AfterContentInit {
    * @param MdSidenav
    * @private
    */
-  private getSidenavEffectiveWidth_(sidenav: MdSidenav, mode: string): number {
+  private _getSidenavEffectiveWidth(sidenav: MdSidenav, mode: string): number {
     if (sidenav != null && sidenav.mode == mode && sidenav.opened) {
-      return sidenav.width_;
+      return sidenav._width;
     }
     return 0;
   }
 
-  private getMarginLeft_() {
-    return this.getSidenavEffectiveWidth_(this.left_, 'side');
+  private _getMarginLeft() {
+    return this._getSidenavEffectiveWidth(this._left, 'side');
   }
 
-  private getMarginRight_() {
-    return this.getSidenavEffectiveWidth_(this.right_, 'side');
+  private _getMarginRight() {
+    return this._getSidenavEffectiveWidth(this._right, 'side');
   }
 
-  private getPositionLeft_() {
-    return this.getSidenavEffectiveWidth_(this.left_, 'push');
+  private _getPositionLeft() {
+    return this._getSidenavEffectiveWidth(this._left, 'push');
   }
 
-  private getPositionRight_() {
-    return this.getSidenavEffectiveWidth_(this.right_, 'push');
+  private _getPositionRight() {
+    return this._getSidenavEffectiveWidth(this._right, 'push');
   }
 }
 
diff --git a/src/core/facade/test_injector.ts b/src/core/facade/test_injector.ts
index 84af577eaf8..5e52872210e 100644
--- a/src/core/facade/test_injector.ts
+++ b/src/core/facade/test_injector.ts
@@ -5,16 +5,16 @@ import {FunctionWrapper, isPresent, Type} from 'angular2/src/facade/lang';
 
 export class TestInjector {
 
-  private instantiated_: boolean = false;
+  private _instantiated: boolean = false;
 
-  private injector_: Injector = null;
+  private _injector: Injector = null;
 
-  private providers_: Array<Type | Provider | any[]> = [];
+  private _providers: Array<Type | Provider | any[]> = [];
 
   reset() {
-    this.injector_ = null;
-    this.providers_ = [];
-    this.instantiated_ = false;
+    this._injector = null;
+    this._providers = [];
+    this._instantiated = false;
   }
 
   platformProviders: Array<Type | Provider | any[]> = [];
@@ -22,25 +22,25 @@ export class TestInjector {
   applicationProviders: Array<Type | Provider | any[]> = [];
 
   addProviders(providers: Array<Type | Provider | any[]>) {
-    if (this.instantiated_) {
+    if (this._instantiated) {
       throw new BaseException('Cannot add providers after test injector is instantiated');
     }
-    this.providers_ = ListWrapper.concat(this.providers_, providers);
+    this._providers = ListWrapper.concat(this._providers, providers);
   }
 
   createInjector() {
     let rootInjector = Injector.resolveAndCreate(this.platformProviders);
-    this.injector_ = rootInjector.resolveAndCreateChild(
-      ListWrapper.concat(this.applicationProviders, this.providers_));
-    this.instantiated_ = true;
-    return this.injector_;
+    this._injector = rootInjector.resolveAndCreateChild(
+      ListWrapper.concat(this.applicationProviders, this._providers));
+    this._instantiated = true;
+    return this._injector;
   }
 
   execute(fn: FunctionWithParamTokens): any {
-    if (!this.instantiated_) {
+    if (!this._instantiated) {
       this.createInjector();
     }
-    return fn.execute(this.injector_);
+    return fn.execute(this._injector);
   }
 }
 
@@ -143,15 +143,15 @@ export function injectAsync(tokens: any[], fn: Function): FunctionWithParamToken
 }
 
 export class FunctionWithParamTokens {
-  constructor(private tokens_: any[], private fn_: Function, public isAsync: boolean) {}
+  constructor(private _tokens: any[], private _fn: Function, public isAsync: boolean) {}
 
   /**
    * Returns the value of the executed function.
    */
   execute(injector: Injector): any {
-    let params = this.tokens_.map(t => injector.get(t));
-    return FunctionWrapper.apply(this.fn_, params);
+    let params = this._tokens.map(t => injector.get(t));
+    return FunctionWrapper.apply(this._fn, params);
   }
 
-  hasToken(token: any): boolean { return this.tokens_.indexOf(token) > -1; }
+  hasToken(token: any): boolean { return this._tokens.indexOf(token) > -1; }
 }
diff --git a/src/core/portal/portal-directives.ts b/src/core/portal/portal-directives.ts
index 8b070838f0b..4f9db8052f4 100644
--- a/src/core/portal/portal-directives.ts
+++ b/src/core/portal/portal-directives.ts
@@ -43,21 +43,21 @@ export class TemplatePortalDirective extends TemplatePortal {
 })
 export class PortalHostDirective extends BasePortalHost {
   /** The attached portal. */
-  private portal_: Portal<any>;
+  private _portal: Portal<any>;
 
   constructor(
-      private dynamicComponentLoader_: DynamicComponentLoader,
-      private elementRef_: ElementRef,
-      private viewContainerRef_: ViewContainerRef) {
+      private _dynamicComponentLoader: DynamicComponentLoader,
+      private _elementRef: ElementRef,
+      private _viewContainerRef: ViewContainerRef) {
     super();
   }
 
   get portal(): Portal<any> {
-    return this.portal_;
+    return this._portal;
   }
 
   set portal(p: Portal<any>) {
-    this.replaceAttachedPortal_(p);
+    this._replaceAttachedPortal(p);
   }
 
   /** Attach the given ComponentPortal to this PortlHost using the DynamicComponentLoader. */
@@ -66,11 +66,11 @@ export class PortalHostDirective extends BasePortalHost {
 
     // If the portal specifies an origin, use that as the logical location of the component
     // in the application tree. Otherwise use the location of this PortalHost.
-    let elementRef = portal.origin != null ? portal.origin : this.elementRef_;
+    let elementRef = portal.origin != null ? portal.origin : this._elementRef;
 
     // Typecast is necessary for Dart transpilation.
     return <Promise<ComponentRef>>
-        this.dynamicComponentLoader_.loadNextToLocation(portal.component, elementRef)
+        this._dynamicComponentLoader.loadNextToLocation(portal.component, elementRef)
         .then(ref => {
           this.setDisposeFn(() => ref.dispose());
           return ref;
@@ -81,9 +81,9 @@ export class PortalHostDirective extends BasePortalHost {
   attachTemplatePortal(portal: TemplatePortal): Promise<Map<string, any>> {
     portal.setAttachedHost(this);
 
-    let viewRef = this.viewContainerRef_.createEmbeddedView(portal.templateRef);
+    let viewRef = this._viewContainerRef.createEmbeddedView(portal.templateRef);
     portal.locals.forEach((v, k) => viewRef.setLocal(k, v));
-    this.setDisposeFn(() => this.viewContainerRef_.clear());
+    this.setDisposeFn(() => this._viewContainerRef.clear());
 
     // TODO(jelbourn): return locals from view
     // Typecast is necessary for Dart transpilation.
@@ -91,13 +91,13 @@ export class PortalHostDirective extends BasePortalHost {
   }
 
   /** Detatches the currently attached Portal (if there is one) and attaches the given Portal. */
-  private replaceAttachedPortal_(p: Portal<any>): void {
+  private _replaceAttachedPortal(p: Portal<any>): void {
     let maybeDetach = this.hasAttached() ? this.detach() : Promise.resolve(null);
 
     maybeDetach.then(_ => {
       if (p != null) {
         this.attach(p);
-        this.portal_ = p;
+        this._portal = p;
       }
     });
   }
diff --git a/src/core/portal/portal.ts b/src/core/portal/portal.ts
index 303a1f90b63..9e3da04887a 100644
--- a/src/core/portal/portal.ts
+++ b/src/core/portal/portal.ts
@@ -10,7 +10,7 @@ import {BaseException} from 'angular2/src/facade/exceptions';
  * It can be attach to / detached from a `PortalHost`.
  */
 export abstract class Portal<T> {
-  private attachedHost_: PortalHost;
+  private _attachedHost: PortalHost;
 
   /** Attach this portal to a host. */
   attach(host: PortalHost): Promise<T> {
@@ -22,24 +22,24 @@ export abstract class Portal<T> {
       throw new BaseException('Host already has a portal attached');
     }
 
-    this.attachedHost_ = host;
+    this._attachedHost = host;
     return <Promise<T>> host.attach(this);
   }
 
   /** Detach this portal from its host */
   detach(): Promise<void> {
-    let host = this.attachedHost_;
+    let host = this._attachedHost;
     if (host == null) {
       throw new BaseException('Portal has no host from which to detach');
     }
 
-    this.attachedHost_ = null;
+    this._attachedHost = null;
     return host.detach();
   }
 
   /** Whether this portal is attached to a host. */
   get isAttached(): boolean {
-    return this.attachedHost_ != null;
+    return this._attachedHost != null;
   }
 
   /**
@@ -47,7 +47,7 @@ export abstract class Portal<T> {
    * the PortalHost when it is performing an `attach()` or `detatch()`.
    */
   setAttachedHost(host: PortalHost) {
-    this.attachedHost_ = host;
+    this._attachedHost = host;
   }
 }
 
@@ -130,17 +130,17 @@ export interface PortalHost {
  */
 export abstract class BasePortalHost implements PortalHost {
   /** The portal currently attached to the host. */
-  private attachedPortal_: Portal<any>;
+  private _attachedPortal: Portal<any>;
 
   /** A function that will permanently dispose this host. */
-  private disposeFn_: () => void;
+  private _disposeFn: () => void;
 
   /** Whether this host has already been permanently disposed. */
-  private isDisposed_: boolean = false;
+  private _isDisposed: boolean = false;
 
   /** Whether this host has an attached portal. */
   hasAttached() {
-    return this.attachedPortal_ != null;
+    return this._attachedPortal != null;
   }
 
   attach(portal: Portal<any>): Promise<any> {
@@ -152,15 +152,15 @@ export abstract class BasePortalHost implements PortalHost {
       throw new BaseException('A portal is already attached');
     }
 
-    if (this.isDisposed_) {
+    if (this._isDisposed) {
       throw new BaseException('This PortalHost has already been disposed');
     }
 
     if (portal instanceof ComponentPortal) {
-      this.attachedPortal_ = portal;
+      this._attachedPortal = portal;
       return this.attachComponentPortal(portal);
     } else if (portal instanceof TemplatePortal) {
-      this.attachedPortal_ = portal;
+      this._attachedPortal = portal;
       return this.attachTemplatePortal(portal);
     }
 
@@ -174,11 +174,11 @@ export abstract class BasePortalHost implements PortalHost {
   abstract attachTemplatePortal(portal: TemplatePortal): Promise<Map<string, any>>;
 
   detach(): Promise<void> {
-    this.attachedPortal_.setAttachedHost(null);
-    this.attachedPortal_ = null;
-    if (this.disposeFn_ != null) {
-      this.disposeFn_();
-      this.disposeFn_ = null;
+    this._attachedPortal.setAttachedHost(null);
+    this._attachedPortal = null;
+    if (this._disposeFn != null) {
+      this._disposeFn();
+      this._disposeFn = null;
     }
 
     return Promise.resolve(null);
@@ -189,10 +189,10 @@ export abstract class BasePortalHost implements PortalHost {
       this.detach();
     }
 
-    this.isDisposed_ = true;
+    this._isDisposed = true;
   }
 
   setDisposeFn(fn: () => void) {
-    this.disposeFn_ = fn;
+    this._disposeFn = fn;
   }
 }
diff --git a/src/directives/dir/dir.ts b/src/directives/dir/dir.ts
index cda0547374e..7fcba324fe6 100644
--- a/src/directives/dir/dir.ts
+++ b/src/directives/dir/dir.ts
@@ -15,18 +15,18 @@ import {OneOf} from '../../core/annotations/one-of';
   exportAs: '$implicit'
 })
 export class Dir {
-  @Input('dir') @OneOf(['ltr', 'rtl']) private dir_: string = 'ltr';
+  @Input('dir') @OneOf(['ltr', 'rtl']) private _dir: string = 'ltr';
 
   @Output() dirChange = new EventEmitter<void>();
 
   @HostBinding('attr.dir')
   get dir(): string {
-    return this.dir_;
+    return this._dir;
   }
   set dir(v: string) {
-    let old = this.dir_;
-    this.dir_ = v;
-    if (old != this.dir_) {
+    let old = this._dir;
+    this._dir = v;
+    if (old != this._dir) {
       this.dirChange.emit(null);
     }
   }
diff --git a/tools/build/dart_analyzer.ts b/tools/build/dart_analyzer.ts
index cd27f62e90e..4ff0a9c1bac 100644
--- a/tools/build/dart_analyzer.ts
+++ b/tools/build/dart_analyzer.ts
@@ -47,12 +47,12 @@ export function analyze(dir: string, command: string, use_ddc: boolean = false):
   fs.writeFileSync(path.join(dir, tempFile), analyzeFile.join('\n'));
 
   return new Promise<void>((resolve, reject) => {
-    analyze_(command, dir, resolve, use_ddc);
+    _analyze(command, dir, resolve, use_ddc);
   });
 }
 
 
-function analyze_(command, dirName, done, useDdc) {
+function _analyze(command, dirName, done, useDdc) {
   // TODO remove --package-warnings once dartanalyzer handles transitive libraries
   var flags = ['--fatal-warnings', '--format=machine'];
 
@@ -158,11 +158,11 @@ class _AnalyzerOutputLine {
   }
 
   static parse(line: string) {
-    const result = this.analyzerParseRegExp_.exec(line);
+    const result = this._analyzerParseRegExp.exec(line);
     return result ? new this(result) : null;
   }
 
-  private static analyzerParseRegExp_ =
+  private static _analyzerParseRegExp =
       new RegExp('([^\|]+)\\|' +           // #1, severity (NONE, INFO, WARNING, ERROR)
                  '([^\|]+)\\|' +           // #2, errorCode.type (HINT, *_WARNING, *_ERROR, etc)
                  '([^\|]+)\\|' +           // #3, errorCode (UNUSED_IMPORT, UNUSED_CATCH_STACK, etc)
@@ -173,7 +173,7 @@ class _AnalyzerOutputLine {
                  '(.*)$');                 // #8, error message
 
   /* Maps file path (as string) to file source (an array of strings, one per line). */
-  private static cache_ = {};
+  private static _cache = {};
 
   private static ERR_NO_SOURCE = '(Could not find source line).';
 
@@ -228,7 +228,7 @@ class _AnalyzerOutputLine {
 
   // Reads the source file for the Analyzer output, caching it for future use.
   _getSourceLine() {
-    var cache = _AnalyzerOutputLine.cache_;
+    var cache = _AnalyzerOutputLine._cache;
     var sourceLines = null;
     if (cache.hasOwnProperty(this.sourcePath)) {
       sourceLines = cache[this.sourcePath];
diff --git a/tools/typings/jasmine/jasmine.d.ts b/tools/typings/jasmine/jasmine.d.ts
index 2b34dd0d39a..a8649eff72c 100644
--- a/tools/typings/jasmine/jasmine.d.ts
+++ b/tools/typings/jasmine/jasmine.d.ts
@@ -153,10 +153,10 @@ declare module jasmine {
         it(description: string, func: () => void): Spec;
         // iit(description: string, func: () => void): Spec; Not a part of jasmine. Angular team adds these
         xit(desc: string, func: () => void): XSpec;
-        compareRegExps_(a: RegExp, b: RegExp, mismatchKeys: string[], mismatchValues: string[]): boolean;
-        compareObjects_(a: any, b: any, mismatchKeys: string[], mismatchValues: string[]): boolean;
-        equals_(a: any, b: any, mismatchKeys: string[], mismatchValues: string[]): boolean;
-        contains_(haystack: any, needle: any): boolean;
+        _compareRegExps(a: RegExp, b: RegExp, mismatchKeys: string[], mismatchValues: string[]): boolean;
+        _compareObjects(a: any, b: any, mismatchKeys: string[], mismatchValues: string[]): boolean;
+        _equals(a: any, b: any, mismatchKeys: string[], mismatchValues: string[]): boolean;
+        _contains(haystack: any, needle: any): boolean;
         addCustomEqualityTester(equalityTester: CustomEqualityTester): void;
         addMatchers(matchers: CustomMatcherFactories): void;
         specFilter(spec: Spec): boolean;
@@ -253,7 +253,7 @@ declare module jasmine {
         insertNext(block: any, ensure?: boolean): void;
         start(onComplete?: () => void): void;
         isRunning(): boolean;
-        next_(): void;
+        _next(): void;
         results(): NestedResults;
     }
 
@@ -343,9 +343,9 @@ declare module jasmine {
         suite: Suite;
 
         afterCallbacks: SpecFunction[];
-        spies_: Spy[];
+        _spies: Spy[];
 
-        results_: NestedResults;
+        _results: NestedResults;
         matchersClass: Matchers;
 
         getFullName(): string;
@@ -358,7 +358,7 @@ declare module jasmine {
         waits(timeout: number): Spec;
         waitsFor(latchFunction: SpecFunction, timeoutMessage?: string, timeout?: number): Spec;
         fail(e?: any): void;
-        getMatchersClass_(): Matchers;
+        _getMatchersClass(): Matchers;
         addMatchers(matchersPrototype: CustomMatcherFactories): void;
         finishCallback(): void;
         finish(onComplete?: () => void): void;
@@ -461,12 +461,12 @@ declare module jasmine {
         new (): any;
 
         suites(): Suite[];
-        summarize_(suiteOrSpec: SuiteOrSpec): any;
+        _summarize(suiteOrSpec: SuiteOrSpec): any;
         results(): any;
         resultsForSpec(specId: any): any;
         log(str: any): any;
         resultsForSpecs(specIds: any): any;
-        summarizeResult_(result: any): any;
+        _summarizeResult(result: any): any;
     }
 
     interface Jasmine {
diff --git a/tslint.json b/tslint.json
index d69c8279fc1..d92c19c433d 100644
--- a/tslint.json
+++ b/tslint.json
@@ -20,7 +20,7 @@
     "no-bitwise": true,
     "no-shadowed-variable": true,
     "no-unused-expression": true,
-    "no-unused-variable": [true, {"ignore-pattern": "ddescribe|iit|.*_$"}],
+    "no-unused-variable": [true, {"ignore-pattern": "^(ddescribe|iit|_.*)$"}],
     "one-line": [
       true,
       "check-catch",
@@ -49,7 +49,7 @@
       true,
       "ban-keywords",
       "check-format",
-      "allow-trailing-underscore"
+      "allow-leading-underscore"
     ],
     "whitespace": [
       true,