diff --git a/locallib.php b/locallib.php
index e2310f3..d057aa8 100644
--- a/locallib.php
+++ b/locallib.php
@@ -1244,8 +1244,8 @@ class attendance {
         foreach ($userids as $userid) {
             $grades[$userid] = new stdClass();
             $grades[$userid]->userid = $userid;
-            $grades[$userid]->rawgrade = att_calc_user_grade_fraction($this->get_user_grade($userid),
-                                                                      $this->get_user_max_grade($userid)) * $this->grade;
+            $grades[$userid]->rawgrade = attendance_calc_user_grade_fraction($this->get_user_grade($userid),
+                                                                             $this->get_user_max_grade($userid)) * $this->grade;
         }
 
         return grade_update('mod/attendance', $this->course->id, 'mod', 'attendance',
@@ -1692,7 +1692,13 @@ function att_get_user_courses_attendances($userid) {
     return $DB->get_records_sql($sql, $params);
 }
 
-function att_calc_user_grade_fraction($grade, $maxgrade) {
+/**
+ * Used to caclulate usergrade based on rawgrade and max grade.
+ *
+ * @param $grade - raw grade for user
+ * @param $maxgrade - maxgrade for this session.
+ */
+function attendance_calc_user_grade_fraction($grade, $maxgrade) {
     if ($maxgrade == 0) {
         return 0;
     } else {
@@ -1700,13 +1706,16 @@ function att_calc_user_grade_fraction($grade, $maxgrade) {
     }
 }
 
-function att_get_gradebook_maxgrade($attid) {
+/**
+ * Update all user grades - used when settings have changed.
+ *
+ * @param $attid
+ * @param $course
+ * @param $context
+ * @param $coursemodule
+ */
+function attendance_update_all_users_grades($attid, $course, $context, $coursemodule) {
     global $DB;
-
-    return $DB->get_field('attendance', 'grade', array('id' => $attid));
-}
-
-function att_update_all_users_grades($attid, $course, $context, $coursemodule) {
     $grades = array();
 
     $userids = array_keys(get_enrolled_users($context, 'mod/attendance:canbelisted', 0, 'u.id'));
@@ -1717,7 +1726,8 @@ function att_update_all_users_grades($attid, $course, $context, $coursemodule) {
         $usergrades = $attgrades->items[0]->grades;
     }
     $statuses = att_get_statuses($attid);
-    $gradebookmaxgrade = att_get_gradebook_maxgrade($attid);
+    // TODO: we should be able to pass full $attendance record into this function and avoid this db call.
+    $gradebookmaxgrade = $DB->get_field('attendance', 'grade', array('id' => $attid));
     foreach ($usergrades as $userid => $existinggrade) {
         if (is_null($existinggrade->grade)) {
             // Don't update grades where one doesn't exist yet.
@@ -1729,7 +1739,7 @@ function att_update_all_users_grades($attid, $course, $context, $coursemodule) {
         $usertakensesscount = att_get_user_taken_sessions_count($attid, $course->startdate, $userid, $coursemodule);
         $usergrade = att_get_user_grade($userstatusesstat, $statuses);
         $usermaxgrade = att_get_user_max_grade($usertakensesscount, $statuses);
-        $grade->rawgrade = att_calc_user_grade_fraction($usergrade, $usermaxgrade) * $gradebookmaxgrade;
+        $grade->rawgrade = attendance_calc_user_grade_fraction($usergrade, $usermaxgrade) * $gradebookmaxgrade;
         $grades[$userid] = $grade;
     }
 
@@ -1743,24 +1753,21 @@ function att_update_all_users_grades($attid, $course, $context, $coursemodule) {
     return $result;
 }
 
-function att_has_logs_for_status($statusid) {
+/**
+ * Check to see if statusid in use to help prevent deletion etc.
+ *
+ * @param integer $statusid
+ */
+function attendance_has_logs_for_status($statusid) {
     global $DB;
-
-    return $DB->count_records('attendance_log', array('statusid' => $statusid)) > 0;
-}
-
-function att_log_convert_url(moodle_url $fullurl) {
-    static $baseurl;
-
-    if (!isset($baseurl)) {
-        $baseurl = new moodle_url('/mod/attendance/');
-        $baseurl = $baseurl->out();
-    }
-
-    return substr($fullurl->out(), strlen($baseurl));
+    return $DB->record_exists('attendance_log', array('statusid' => $statusid));
 }
 
-// Helper function to add sessiondate_selector to form.
+/**
+ * Helper function to add sessiondate_selector to add/update forms.
+ *
+ * @param MoodleQuickForm $mform
+ */
 function attendance_form_sessiondate_selector (MoodleQuickForm $mform) {
 
     $mform->addElement('date_selector', 'sessiondate', get_string('sessiondate', 'attendance'));
diff --git a/preferences.php b/preferences.php
index 5e2f99c..03bbd3c 100644
--- a/preferences.php
+++ b/preferences.php
@@ -76,7 +76,7 @@ switch ($att->pageparams->action) {
         }
         break;
     case att_preferences_page_params::ACTION_DELETE:
-        if (att_has_logs_for_status($att->pageparams->statusid)) {
+        if (attendance_has_logs_for_status($att->pageparams->statusid)) {
             print_error('cantdeletestatus', 'attendance', "attsettings.php?id=$id");
         }
 
@@ -123,7 +123,7 @@ switch ($att->pageparams->action) {
             $errors[$id] = $att->update_status($status, $acronym[$id], $description[$id], $grade[$id], null);
         }
         if ($att->grade > 0) {
-            att_update_all_users_grades($att->id, $att->course, $att->context, $cm);
+            attendance_update_all_users_grades($att->id, $att->course, $att->context, $cm);
         }
         break;
 }
diff --git a/renderables.php b/renderables.php
index 64329f9..925393d 100644
--- a/renderables.php
+++ b/renderables.php
@@ -554,7 +554,7 @@ class attendance_preferences_data implements renderable {
         $this->errors = $errors;
 
         foreach ($this->statuses as $st) {
-            $st->haslogs = att_has_logs_for_status ($st->id);
+            $st->haslogs = attendance_has_logs_for_status($st->id);
         }
 
         $this->att = $att;
diff --git a/sessions.php b/sessions.php
index 18ffee4..e42768f 100644
--- a/sessions.php
+++ b/sessions.php
@@ -114,7 +114,7 @@ switch ($att->pageparams->action) {
         if (isset($confirm) && confirm_sesskey()) {
             $att->delete_sessions(array($sessionid));
             if ($att->grade > 0) {
-                att_update_all_users_grades($att->id, $att->course, $att->context, $cm);
+                attendance_update_all_users_grades($att->id, $att->course, $att->context, $cm);
             }
             redirect($att->url_manage(), get_string('sessiondeleted', 'attendance'));
         }
@@ -143,7 +143,7 @@ switch ($att->pageparams->action) {
 
             $att->delete_sessions($sessionsids);
             if ($att->grade > 0) {
-                att_update_all_users_grades($att->id, $att->course, $att->context, $cm);
+                attendance_update_all_users_grades($att->id, $att->course, $att->context, $cm);
             }
             redirect($att->url_manage(), get_string('sessiondeleted', 'attendance'));
         }