diff --git a/question/category.php b/question/category.php
index 5ad3de94049..596abddab2d 100644
--- a/question/category.php
+++ b/question/category.php
@@ -31,7 +31,7 @@ require_once($CFG->dirroot."/question/category_class.php");
 list($thispageurl, $contexts, $cmid, $cm, $module, $pagevars) =
         question_edit_setup('categories', '/question/category.php');
 
-// get values from form for actions on this page
+// Get values from form for actions on this page.
 $param = new stdClass();
 $param->moveup = optional_param('moveup', 0, PARAM_INT);
 $param->movedown = optional_param('movedown', 0, PARAM_INT);
@@ -55,19 +55,33 @@ foreach ((array)$param as $key=>$value) {
 }
 $PAGE->set_url($url);
 
-$qcobject = new question_category_object($pagevars['cpage'], $thispageurl, $contexts->having_one_edit_tab_cap('categories'), $param->edit, $pagevars['cat'], $param->delete,
-                            $contexts->having_cap('moodle/question:add'));
+$qcobject = new question_category_object($pagevars['cpage'], $thispageurl,
+        $contexts->having_one_edit_tab_cap('categories'), $param->edit,
+        $pagevars['cat'], $param->delete, $contexts->having_cap('moodle/question:add'));
 
-$streditingcategories = get_string('editcategories', 'question');
-if ($param->left || $param->right || $param->moveup || $param->movedown|| $param->moveupcontext || $param->movedowncontext){
+if ($param->left || $param->right || $param->moveup || $param->movedown) {
     require_sesskey();
-    foreach ($qcobject->editlists as $list){
-        //processing of these actions is handled in the method where appropriate and page redirects.
-        $list->process_actions($param->left, $param->right, $param->moveup, $param->movedown,
-                                $param->moveupcontext, $param->movedowncontext, $param->tocontext);
+
+    foreach ($qcobject->editlists as $list) {
+        // Processing of these actions is handled in the method where appropriate and page redirects.
+        $list->process_actions($param->left, $param->right, $param->moveup, $param->movedown);
     }
 }
-if ($param->delete && ($questionstomove = $DB->count_records("question", array("category" => $param->delete)))){
+
+if ($param->moveupcontext || $param->movedowncontext) {
+    require_sesskey();
+
+    if ($param->moveupcontext) {
+        $catid = $param->moveupcontext;
+    } else {
+        $catid = $param->movedowncontext;
+    }
+    $oldcat = $DB->get_record('question_categories', array('id' => $catid), '*', MUST_EXIST);
+    $qcobject->update_category($catid, '0,'.$param->tocontext, $oldcat->name, $oldcat->info);
+    // The previous line does a redirect().
+}
+
+if ($param->delete && ($questionstomove = $DB->count_records("question", array("category" => $param->delete)))) {
     if (!$category = $DB->get_record("question_categories", array("id" => $param->delete))) {  // security
         print_error('nocate', 'question', $thispageurl->out(), $param->delete);
     }
@@ -86,6 +100,7 @@ if ($param->delete && ($questionstomove = $DB->count_records("question", array("
 } else {
     $questionstomove = 0;
 }
+
 if ($qcobject->catform->is_cancelled()) {
     redirect($thispageurl);
 } else if ($catformdata = $qcobject->catform->get_data()) {
@@ -101,21 +116,21 @@ if ($qcobject->catform->is_cancelled()) {
     redirect($thispageurl);
 }
 
-if ($param->edit){
+if ($param->edit) {
     $PAGE->navbar->add(get_string('editingcategory', 'question'));
 }
 
-$PAGE->set_title($streditingcategories);
+$PAGE->set_title(get_string('editcategories', 'question'));
 $PAGE->set_heading($COURSE->fullname);
 echo $OUTPUT->header();
 
-// display UI
+// Display the UI.
 if (!empty($param->edit)) {
     $qcobject->edit_single_category($param->edit);
 } else if ($questionstomove){
     $qcobject->display_move_form($questionstomove, $category);
 } else {
-    // display the user interface
+    // Display the user interface.
     $qcobject->display_user_interface();
 }
 echo $OUTPUT->footer();