diff --git a/lib/Alternc/Diagnostic/Format/Abstract.php b/lib/Alternc/Diagnostic/Format/Abstract.php
index 58001499..e1e0f012 100644
--- a/lib/Alternc/Diagnostic/Format/Abstract.php
+++ b/lib/Alternc/Diagnostic/Format/Abstract.php
@@ -83,6 +83,32 @@ class Alternc_Diagnostic_Format_Abstract {
         return $this->directory;
     }
 
+    /**
+     * Checks a file reference is ok
+     * 
+     * @param string $file_name
+     * @return boolean
+     * @throws \Exception
+     */
+    function checkIsFileReadable($file_name){
+        
+        $file_path                          = $this->directory->getFile_path() .DIRECTORY_SEPARATOR.$file_name;
+        if( ! is_file( $file_path)){
+            throw new \Exception("Invalid file: $file_path does not exist.");
+        }
+        
+        if( !is_readable( $file_path)){
+            throw new \Exception("Invalid file: $file_path cannot be read.");
+        }
+        return true;
+    }
 
+    function getFileContent( $file_reference ){
+        
+        $file_path                          = $this->directory->getFile_path() .DIRECTORY_SEPARATOR.$file_reference;
+        return file_get_contents($file_path);
+        
+    }
+    
 }
 
diff --git a/lib/Alternc/Diagnostic/Format/Factory.php b/lib/Alternc/Diagnostic/Format/Factory.php
new file mode 100644
index 00000000..128047d0
--- /dev/null
+++ b/lib/Alternc/Diagnostic/Format/Factory.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * Used to unserialize files
+ */
+class Alternc_Diagnostic_Format_Factory{
+    
+    /**
+     *
+     * @var string
+     */
+    protected $file_name;
+    /**
+     *
+     * @var Alternc_Diagnostic_Directory
+     */
+    protected $directory;
+
+    /**
+     * 
+     * @param string $file_name
+     * @param Alternc_Diagnostic_Directory $directory
+     */
+    public function __construct( $file_name, Alternc_Diagnostic_Directory $directory ) {
+        
+        $this->file_name                    = $file_name;
+        $this->directory                    = $directory;
+        
+    }
+    
+    /**
+     * Reads file and converts into data
+     * 
+     * @return Alternc_Diagnostic_Data
+     */
+    function build(){
+        
+        $extension                          = pathinfo($this->file_name, PATHINFO_EXTENSION);
+        $class_name                         = "Alternc_Diagnostic_Format_".ucfirst(strtolower($extension));
+        $format                             = new $class_name($this->directory);
+        $dataInstance                       = $format->read($this->file_name);
+        return $dataInstance;
+
+    }
+    
+    
+}
\ No newline at end of file
diff --git a/lib/Alternc/Diagnostic/Format/Interface.php b/lib/Alternc/Diagnostic/Format/Interface.php
index 662bcb15..439135e3 100644
--- a/lib/Alternc/Diagnostic/Format/Interface.php
+++ b/lib/Alternc/Diagnostic/Format/Interface.php
@@ -14,7 +14,7 @@ interface Alternc_Diagnostic_Format_Interface{
     /**
      * Writes a Data object to file
      * 
-     * @return boolean
+     * @return string file_name
      */
     function write();
     
diff --git a/lib/Alternc/Diagnostic/Format/Json.php b/lib/Alternc/Diagnostic/Format/Json.php
index ccd77039..2a9a98fb 100644
--- a/lib/Alternc/Diagnostic/Format/Json.php
+++ b/lib/Alternc/Diagnostic/Format/Json.php
@@ -21,6 +21,22 @@ class Alternc_Diagnostic_Format_Json
      */
     function read( $file_reference ){
         
+        // Attempts to check file is ok
+        $this->checkIsFileReadable($file_reference);
+        
+        // Attempts to retrieve file content
+        $file_content                   = $this->getFileContent($file_reference);
+        
+        // Attempts to convert string to json
+        $arrayData                      = json_decode($file_content,true);
+        
+        // Exits if error
+        if(json_last_error()){
+            throw new \Exception("Failed to convert file $file_reference from JSON with PHP JSON_ERROR #". json_last_error());
+        }
+        
+        // Returns data object
+        return $this->convertJsonToData( $arrayData );
     }
     
     
@@ -40,8 +56,28 @@ class Alternc_Diagnostic_Format_Json
         if( ! file_put_contents($filename, $file_content) ){
             throw new \Exception("Failed to write in json format to file $filename for data".serialize($this->getData()));
         }
-        return true;
+        return $filename;
     }
     
     
+    /**
+     * Operates the conversion recursively
+     * 
+     * @param array $arrayData
+     * @return \Alternc_Diagnostic_Data
+     */
+    function convertJsonToData( $arrayData ){
+        
+        $dataInstance                   = new Alternc_Diagnostic_Data($arrayData["type"]);
+        $dataInstance->setMetadata($arrayData["metadata"]);
+        if( Alternc_Diagnostic_Data::TYPE_SECTION === $arrayData["type"] ){
+            $dataInstance->setData($arrayData["data"]);
+            return $dataInstance;
+        }
+        foreach($arrayData["data"] as $key => $value){
+            $dataInstance->addData($key, $this->convertJsonToData($value));
+        }
+        return $dataInstance;
+    }
+    
 }
\ No newline at end of file
diff --git a/lib/Alternc/Diagnostic/Format/Resolver.php b/lib/Alternc/Diagnostic/Format/Resolver.php
new file mode 100644
index 00000000..6b9fe1a4
--- /dev/null
+++ b/lib/Alternc/Diagnostic/Format/Resolver.php
@@ -0,0 +1,60 @@
+<?php
+
+
+class Alternc_Diagnostic_Format_Resolver {
+    
+
+    /**
+     * @var Alternc_Diagnostic_Directory
+     */
+    public $directoryInstance;
+    
+    
+    /**
+     * 
+     * @param Alternc_Diagnostic_Directory $directoryInstance
+     */
+    public function __construct( Alternc_Diagnostic_Directory $directoryInstance ) {
+        
+        $this->directoryInstance         = $directoryInstance;
+        
+    }
+    /**
+     * Attempts to convert an int or a string to a file reference
+     * 
+     * @param int|string $file_reference
+     * @return string
+     * @throws \Exception
+     * 
+     */
+    public function resolve( $file_reference ){
+        if(is_int($file_reference) or preg_match("/\d+/",$file_reference)){
+            $fileList                   = $this->directoryInstance->getList();
+            if(array_key_exists($file_reference, $fileList)){
+                $file_reference         = $fileList[$file_reference];
+            }
+            else{
+                throw new \Exception("Invalid file reference $file_reference");
+            }
+        }
+        return $file_reference;
+    }
+
+
+    /**
+     * Finds a file by reference or name
+     * 
+     * @param mixed $file_reference
+     * @throws \Exception
+     * @return Alternc_Diagnostic_Data Resulting data
+     */
+    function getDataInstance( $file_reference){
+        
+        // Attempts to retrieve the file name
+        $file_reference                 = $this->resolve($file_reference);
+        // Uses factory to resolve the format
+        $factoryInstance                = new Alternc_Diagnostic_Format_Factory( $file_reference, $this->directoryInstance);
+        return $factoryInstance->build();
+        
+    }
+}