diff --git a/application/config/version.php b/application/config/version.php
index 3275348405..e86a3a3b10 100644
--- a/application/config/version.php
+++ b/application/config/version.php
@@ -26,8 +26,8 @@
 /**
  * @var string The application files version number.
  */
-$config['version'] = '1.14.0';
-$config['release_date']  = '2016-11-08';
+$config['version'] = '1.15.0';
+$config['release_date']  = '2016-11-12';
 $config['repository'] = 'https://github.com/Indicia-Team/warehouse/releases';
 
 ?>
diff --git a/application/helpers/report_standard_params_occurrences.php b/application/helpers/report_standard_params_occurrences.php
index 1eb4221b4d..8ee424b6ff 100644
--- a/application/helpers/report_standard_params_occurrences.php
+++ b/application/helpers/report_standard_params_occurrences.php
@@ -75,6 +75,9 @@ public static function getOperationParameters() {
         'description'=>'Mode for filtering by taxon rank in the hierarchy',
         'lookup_values'=>'=:include only this level in the hierarchy,>=:include this level and lower,<=:include this level and higher'
       ),
+      'identification_difficulty' => array('datatype'=>'lookup', 'default'=>'', 'display'=>'Identification difficulty operation',
+        'description'=>'Identification difficulty lookup operation', 'lookup_values'=>'=:is,>=:is at least,<=:is at most'
+      ),
     );
   }
 
@@ -389,7 +392,14 @@ public static function getParameters() {
             "join taxa_taxon_designations ttd on ttd.taxon_id=ttlpref.taxon_id and ttd.deleted=false " .
             "and ttd.taxon_designation_id in (#taxon_designation_list#)")
         ),
-      )
+      ),
+      'identification_difficulty' => array('datatype'=>'integer', 'default'=>'', 'display'=>'Identification difficulty',
+        'description'=>'Identification difficulty on a scale of 1 to 5',
+        'wheres' => array(
+          array('value'=>'', 'operator'=>'',
+            'sql'=>"coalesce(o.identification_difficulty, 0) #identification_difficulty_op# #identification_difficulty#")
+        )
+      ),
     );
   }
   
@@ -427,7 +437,8 @@ public static function getLegacyStructureParameters() {
       'edited_date_to' => array(
         'wheres' => array(
           array('value'=>'', 'operator'=>'', 
-            'sql'=>"('#edited_date_to#'='Click here' OR (o.cache_updated_on <= '#edited_date_to#'::timestamp OR (length('#edited_date_to#')<=10 AND o.cache_updated_on < cast('#input_date_to#' as date) + '1 day'::interval)))")
+            'sql'=>"('#edited_date_to#'='Click here' OR (o.cache_updated_on <= '#edited_date_to#'::timestamp ' .
+                'OR (length('#edited_date_to#')<=10 AND o.cache_updated_on < cast('#input_date_to#' as date) + '1 day'::interval)))")
         )
       ),
       'edited_date_age' => array(
@@ -459,7 +470,7 @@ public static function getLegacyStructureParameters() {
         'wheres' => array(
           array('value'=>'', 'operator'=>'', 'sql'=>"o.images is not null")
         )
-      ),
+      )
     );
   }
 
@@ -476,12 +487,14 @@ public static function getDefaultParameterValues() {
       'input_form_list_op'=>'in',
       'location_list_op'=>'in',
       'indexed_location_list_op'=>'in',
+      'identification_difficulty_op'=>'=',
       'occurrence_id_op_context'=>'=',
       'website_list_op_context'=>'in',
       'survey_list_op_context'=>'in',
       'input_form_list_op_context'=>'in',
       'location_list_op_context'=>'in',
       'indexed_location_list_op_context'=>'in',
+      'identification_difficulty_op_context'=>'=',
       'release_status'=>'R'
     );
   }
diff --git a/modules/cache_builder/db/version_0_1_1/.gitignore b/modules/cache_builder/db/version_0_1_1/.gitignore
deleted file mode 100644
index 86d0cb2726..0000000000
--- a/modules/cache_builder/db/version_0_1_1/.gitignore
+++ /dev/null
@@ -1,4 +0,0 @@
-# Ignore everything in this directory
-*
-# Except this file
-!.gitignore
\ No newline at end of file
diff --git a/modules/cache_builder/db/version_1_15_0/201611121607_cache_occurrences_id_diff.sql b/modules/cache_builder/db/version_1_15_0/201611121607_cache_occurrences_id_diff.sql
new file mode 100644
index 0000000000..ce20ccbec5
--- /dev/null
+++ b/modules/cache_builder/db/version_1_15_0/201611121607_cache_occurrences_id_diff.sql
@@ -0,0 +1,4 @@
+ALTER TABLE cache_occurrences_functional ADD COLUMN identification_difficulty integer;
+
+COMMENT ON COLUMN cache_occurrences_functional.identification_difficulty IS
+  'Identification difficulty assigned by the data_cleaner module, on a scale from 1 (easy) to 5 (difficult)';
\ No newline at end of file
diff --git a/modules/cache_builder/db/version_1_15_0/201611121607_cache_occurrences_id_diff_data.sql b/modules/cache_builder/db/version_1_15_0/201611121607_cache_occurrences_id_diff_data.sql
new file mode 100644
index 0000000000..86389c9d0d
--- /dev/null
+++ b/modules/cache_builder/db/version_1_15_0/201611121607_cache_occurrences_id_diff_data.sql
@@ -0,0 +1,8 @@
+-- #slow script#
+
+update cache_occurrences_functional o
+  set identification_difficulty=vrd.value::integer
+from verification_rule_data vrd
+join verification_rules vr on vr.id=vrd.verification_rule_id and vr.deleted=false
+    and vr.test_type='IdentificationDifficulty'
+where vrd.header_name='Data' and upper(vrd.key)=o.taxa_taxon_list_external_key and vrd.deleted=false;
\ No newline at end of file