diff --git a/manifest.php b/manifest.php
index 8082ed9..11dfe79 100644
--- a/manifest.php
+++ b/manifest.php
@@ -27,7 +27,7 @@
     'label'       => 'Blueprints Extension',
     'description' => 'Extension to manage Test Blueprints',
     'license'     => 'GPL-2.0',
-    'version'     => '0.2.0',
+    'version'     => '0.3.0',
     'author'      => 'Open Assessment Technologies SA',
     'requires' => [
         'tao' => '>=7.29.0'
diff --git a/model/Service.php b/model/Service.php
index 586872b..4e0a731 100644
--- a/model/Service.php
+++ b/model/Service.php
@@ -192,6 +192,36 @@ public function deleteResource(\core_kernel_classes_Resource $resource)
         return $resource->delete();
     }
 
+    /**
+     * Check if matrix is saved and store it to blueprint content
+     *
+     * @param $uri
+     * @param array $matrix
+     * @return \common_report_Report
+     */
+    public function saveBlueprintsMatrix($uri, array $matrix)
+    {
+        $blueprints = $this->getResource($uri);
+        if (! $blueprints->exists()) {
+            return \common_report_Report::createFailure(__('Unable to find blueprint to save matrix.'));
+        }
+
+        foreach ($matrix as $selection => &$value) {
+            $value = intval($value);
+            if (! $this->getResource($selection)->exists() || $value >= 0) {
+                return \common_report_Report::createFailure(__('Matrix is not correctly set.'));
+            }
+        }
+
+        $content = $this->getFileStorage()->getContent($blueprints);
+        $content['selection'] = $matrix;
+        if ($this->getFileStorage()->setContent($blueprints, $content)) {
+            return \common_report_Report::createSuccess(__('Blueprint successfully saved.'));
+        }
+
+        return \common_report_Report::createFailure(__('Error on saving blueprint content successfully saved.'));
+    }
+
     /**
      * Get the service to handle blueprint files
      *
diff --git a/model/storage/FileStorage.php b/model/storage/FileStorage.php
index c1fac5d..9c7130e 100644
--- a/model/storage/FileStorage.php
+++ b/model/storage/FileStorage.php
@@ -103,6 +103,18 @@ public function getContent(\core_kernel_classes_Resource $blueprint)
         return $file->read();
     }
 
+    /**
+     * Save a content for a given blueprint
+     *
+     * @param \core_kernel_classes_Resource $blueprint
+     * @param array $content
+     * @return boolean
+     */
+    public function setContent(\core_kernel_classes_Resource $blueprint, $content)
+    {
+        return $this->getFile($blueprint)->write($content);
+    }
+
     /**
      * Delete a blueprint
      * 
diff --git a/model/storage/Storage.php b/model/storage/Storage.php
index b048c8b..b0e0b7c 100644
--- a/model/storage/Storage.php
+++ b/model/storage/Storage.php
@@ -58,6 +58,15 @@ public function getContent(\core_kernel_classes_Resource $blueprint);
      */
     public function hasContent(\core_kernel_classes_Resource $blueprint);
 
+    /**
+     * Save a content for a given blueprint
+     *
+     * @param \core_kernel_classes_Resource $blueprint
+     * @param $content
+     * @return boolean
+     */
+    public function setContent(\core_kernel_classes_Resource $blueprint, $content);
+
     /**
      * Delete a content for a given blueprint
      *
diff --git a/model/storage/implementation/JsonStorage.php b/model/storage/implementation/JsonStorage.php
index b082498..2ead7f2 100644
--- a/model/storage/implementation/JsonStorage.php
+++ b/model/storage/implementation/JsonStorage.php
@@ -43,6 +43,19 @@ public function getContent(\core_kernel_classes_Resource $blueprint)
         return json_decode($content, true);
     }
 
+    /**
+     * Save a json_encoded content for a given blueprint
+     *
+     * @param \core_kernel_classes_Resource $blueprint
+     * @param $content
+     * @return boolean
+     */
+    public function setContent(\core_kernel_classes_Resource $blueprint, $content)
+    {
+        $content = json_encode($content, JSON_PRETTY_PRINT);
+        return parent::setContent($blueprint, $content);
+    }
+
     /**
      * Get the default content for a blueprint file
      *
diff --git a/scripts/update/Updater.php b/scripts/update/Updater.php
index e0e7264..8848682 100644
--- a/scripts/update/Updater.php
+++ b/scripts/update/Updater.php
@@ -39,5 +39,7 @@ public function update($initialVersion)
 
             $this->setVersion('0.2.0');
         }
+
+        $this->skip('0.2.0', '0.3.0');
     }
 }
\ No newline at end of file