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diff --git a/mobile_src/handlers.js b/mobile_src/handlers.js
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+// (C) Copyright 2015 Martin Dougiamas
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+angular.module('mm.addons.qtype_algebra')
+
+/**
+ * Short answer question handlers.
+ *
+ * @module mm.addons.qtype_algebra
+ * @ngdoc service
+ * @name $mmaQtypeAlgebraHandler
+ */
+.factory('$mmaQtypeAlgebraHandler', function($mmUtil) {
+
+    var self = {};
+
+    /**
+     * Check if a response is complete.
+     *
+     * @param  {Object} question Question.
+     * @param  {Object} answers  Question answers (without prefix).
+     * @return {Mixed}           True if complete, false if not complete, -1 if cannot determine.
+     */
+    self.isCompleteResponse = function(question, answers) {
+        return answers['answer'] || answers['answer'] === 0;
+    };
+
+    /**
+     * Whether or not the module is enabled for the site.
+     *
+     * @return {Boolean}
+     */
+    self.isEnabled = function() {
+        return true;
+    };
+
+    /**
+     * Check if a student has provided enough of an answer for the question to be graded automatically,
+     * or whether it must be considered aborted.
+     *
+     * @param  {Object} question Question.
+     * @param  {Object} answers  Question answers (without prefix).
+     * @return {Mixed}           True if gradable, false if not gradable, -1 if cannot determine.
+     */
+    self.isGradableResponse = function(question, answers) {
+        return self.isCompleteResponse(question, answers);
+    };
+
+    /**
+     * Check if two responses are the same.
+     *
+     * @param  {Object} question    Question.
+     * @param  {Object} prevAnswers Previous answers.
+     * @param  {Object} newAnswers  New answers.
+     * @return {Boolean}            True if same, false otherwise.
+     */
+    self.isSameResponse = function(question, prevAnswers, newAnswers) {
+        return $mmUtil.sameAtKeyMissingIsBlank(prevAnswers, newAnswers, 'answer');
+    };
+
+    /**
+     * Get the directive.
+     *
+     * @param {Object} question The question.
+     * @return {String}         Directive's name.
+     */
+    self.getDirectiveName = function(question) {
+        return 'mma-qtype-algebra';
+    };
+
+    return self;
+});