diff --git a/services/web/app/views/project/editor/header.jade b/services/web/app/views/project/editor/header.jade
index 44f384a376..2dd84db21d 100644
--- a/services/web/app/views/project/editor/header.jade
+++ b/services/web/app/views/project/editor/header.jade
@@ -136,7 +136,7 @@ div(ng-if="shouldABTestHeaderLabels")
 		)
 			a.btn.btn-full-height(
 				href,
-				ng-click="ui.leftMenuShown = true"
+				ng-click="ui.leftMenuShown = true; trackABTestConversion('menu');"
 				tooltip='#{translate("menu")}',
 				tooltip-placement="bottom",
 				tooltip-append-to-body="true",
@@ -229,7 +229,7 @@ div(ng-if="shouldABTestHeaderLabels")
 					tooltip="#{translate('share')}",
 					tooltip-placement="bottom",
 					ng-mouseenter="trackHover('share')"
-					ng-click="openShareProjectModal()",
+					ng-click="openShareProjectModal(); trackABTestConversion('share');",
 					ng-controller="ShareController",
 					sixpack-convert="editor-header"
 				)
@@ -237,7 +237,7 @@ div(ng-if="shouldABTestHeaderLabels")
 				a.btn.btn-full-height(
 					href,
 					ng-mouseenter="trackHover('track-changes')"
-					ng-click="toggleTrackChanges()",
+					ng-click="toggleTrackChanges(); trackABTestConversion('history');",
 					ng-class="{ active: (ui.view == 'track-changes') }"
 					tooltip="#{translate('recent_changes')}",
 					tooltip-placement="bottom",
@@ -250,7 +250,7 @@ div(ng-if="shouldABTestHeaderLabels")
 					tooltip-placement="bottom",
 					ng-class="{ active: ui.chatOpen }",
 					ng-mouseenter="trackHover('chat')"
-					ng-click="toggleChat()",
+					ng-click="toggleChat(); trackABTestConversion('chat');",
 					ng-controller="ChatButtonController",
 					ng-show="!anonymous",
 					sixpack-convert="editor-header"
@@ -270,7 +270,7 @@ div(ng-if="shouldABTestHeaderLabels")
 			.toolbar-left
 				a.btn.btn-full-height(
 					href,
-					ng-click="ui.leftMenuShown = true",
+					ng-click="ui.leftMenuShown = true; trackABTestConversion('menu');",
 					sixpack-convert="editor-header"
 				)
 					i.fa.fa-fw.fa-bars
@@ -355,7 +355,7 @@ div(ng-if="shouldABTestHeaderLabels")
 				a.btn.btn-full-height(
 					href,
 					ng-if="permissions.admin",
-					ng-mouseenter="trackHover('share')"
+					ng-mouseenter="trackHover('share'); trackABTestConversion('share');"
 					ng-click="openShareProjectModal()",
 					ng-controller="ShareController",
 					sixpack-convert="editor-header"
@@ -365,7 +365,7 @@ div(ng-if="shouldABTestHeaderLabels")
 				a.btn.btn-full-height(
 					href,
 					ng-mouseenter="trackHover('track-changes')"
-					ng-click="toggleTrackChanges()",
+					ng-click="toggleTrackChanges(); trackABTestConversion('history');",
 					ng-class="{ active: (ui.view == 'track-changes') }",
 					sixpack-convert="editor-header"
 				)
@@ -375,7 +375,7 @@ div(ng-if="shouldABTestHeaderLabels")
 					href,
 					ng-class="{ active: ui.chatOpen }",
 					ng-mouseenter="trackHover('chat')"
-					ng-click="toggleChat()",
+					ng-click="toggleChat(); trackABTestConversion('chat');",
 					ng-controller="ChatButtonController",
 					ng-show="!anonymous",
 					sixpack-convert="editor-header"
diff --git a/services/web/public/coffee/ide.coffee b/services/web/public/coffee/ide.coffee
index e9e759eaf6..57c89dc932 100644
--- a/services/web/public/coffee/ide.coffee
+++ b/services/web/public/coffee/ide.coffee
@@ -44,7 +44,7 @@ define [
 	SafariScrollPatcher
 ) ->
 
-	App.controller "IdeController", ($scope, $timeout, ide, localStorage, event_tracking) ->
+	App.controller "IdeController", ($scope, $timeout, ide, localStorage, sixpack, event_tracking) ->
 		# Don't freak out if we're already in an apply callback
 		$scope.$originalApply = $scope.$apply
 		$scope.$apply = (fn = () ->) ->
@@ -73,10 +73,22 @@ define [
 
 
 		# Only run the header AB test for newly registered users.
-		_abTestStartDate = new Date(Date.UTC(2016, 8, 22))
+		_abTestStartDate = new Date(Date.UTC(2016, 8, 28))
 		_userSignUpDate = new Date(window.user.signUpDate)
 		
-		$scope.shouldABTestHeaderLabels = _userSignUpDate > _abTestStartDate
+		$scope.shouldABTestHeaderLabels = _userSignUpDate < _abTestStartDate
+		$scope.headerLabelsABVariant = ""
+
+		if ($scope.shouldABTestHeaderLabels)
+			sixpack.participate "editor-header", [ "default", "labels"], (chosenVariation) ->
+				$scope.headerLabelsABVariant = chosenVariation
+
+		$scope.trackABTestConversion = (headerItem) ->
+			event_tracking.sendMB "header-label-ab-conversion", {
+				headerItem: headerItem,
+				variant: $scope.headerLabelsABVariant
+			}
+
 
 		# Tracking code.
 		$scope.$watch "ui.view", (newView, oldView) ->