diff --git a/libraries/ElementChecker/src/ElementChecker/Checker/Checker.cpp b/libraries/ElementChecker/src/ElementChecker/Checker/Checker.cpp
index 8635cb6..ff96a50 100644
--- a/libraries/ElementChecker/src/ElementChecker/Checker/Checker.cpp
+++ b/libraries/ElementChecker/src/ElementChecker/Checker/Checker.cpp
@@ -1,6 +1,12 @@
-
 #include "Checker.hpp"
 
+#include <Common/log.hpp>
+#include <BasicElement/SubElements/Data.hpp>
+#include <BasicElement/SubElements/Number.hpp>
+#include <ElementChecker/Translator/Translator.hpp>
+
+#include <algorithm>
+
 namespace element_checker
 {
 
@@ -11,7 +17,100 @@ Checker::Checker( const std::shared_ptr< basic_element::Element > element )
 
 void Checker::check()
 {
-	std::cout << _element->getType() << std::cout;
+	LOG_INFO( _element->getType() );
+
+	switch( _element->getType() )
+	{
+		case eTypeUnknown : 
+		{
+			LOG_ERROR( "Unknown element type, cannot check it" );
+			_element->setStatus( eStatusInvalid );
+			break;
+		}
+		case eTypeNumber  :
+		{
+			std::shared_ptr< basic_element::Number > number = std::static_pointer_cast< basic_element::Number >( _element );
+			_element->setStatus( checkNumber( number ) );
+			break;
+		}
+		case eTypeExif    :
+		{
+			break;
+		}
+		case eTypeData    :
+		{
+			std::shared_ptr< basic_element::Data > data = std::static_pointer_cast< basic_element::Data >( _element );
+			_element->setStatus( checkData( data ) );
+			break;
+		}
+		case eTypeKlv     :		
+		{
+			break;
+		}
+	}
+
+}
+
+EStatus Checker::checkData( std::shared_ptr< basic_element::Data > data )
+{
+	if( data->getSize() == 0 )
+		LOG_WARNING( data->getId() << ": Null data size !" );
+
+	if( data->getValues().empty() )
+	{
+		return eStatusPassOver;
+	}
+
+	EStatus status = eStatusInvalid;
+	switch( data->getSubType() )
+	{
+		case eSubTypeAscii :
+		case eSubTypeHexa :
+		{
+			std::string orig = Translator( data.get() ).get();
+			std::string lowCase = orig;
+			std::string upCase  = orig;
+			std::transform( lowCase.begin(), lowCase.end(), lowCase.begin(), ::tolower );
+			std::transform(  upCase.begin(),  upCase.end(),  upCase.begin(), ::toupper );
+
+			for( std::string value : data->getValues() )
+				if( value == orig || value == lowCase || value == upCase )
+					status = eStatusValid;
+			
+			if( status == eStatusInvalid )
+				data->addErrorLabel( "Invalid value" );
+			return status;
+		}
+
+		case eSubTypeRaw :
+		{
+			return eStatusPassOver;
+		}
+		
+		case eSubTypeUnknown :
+		default:
+		{
+			data->addErrorLabel( "Invalid subtype" );
+			break;
+		}
+	}
+	return status;
+}
+
+EStatus Checker::checkNumber( std::shared_ptr< basic_element::Number > number )
+{
+	EStatus status = eStatusInvalid;
+
+	if( number->getRange().empty() )
+	{
+		return eStatusPassOver;
+	}
+	
+	// if( isNumberInRange() )	// @todo
+	// 	status = eStatusValid;
+
+	// LOG_TRACE( "status: " << status );
+	return status;
 }
 
 }
diff --git a/libraries/ElementChecker/src/ElementChecker/Checker/Checker.hpp b/libraries/ElementChecker/src/ElementChecker/Checker/Checker.hpp
index 45cab33..3768078 100644
--- a/libraries/ElementChecker/src/ElementChecker/Checker/Checker.hpp
+++ b/libraries/ElementChecker/src/ElementChecker/Checker/Checker.hpp
@@ -7,6 +7,12 @@
 #include <iostream>
 #include <memory>
 
+namespace basic_element
+{
+	class Data;
+	class Number;
+}
+
 namespace element_checker
 {
 
@@ -18,6 +24,10 @@ class Checker
 
 	void check();
 
+private:
+	EStatus checkData  ( std::shared_ptr< basic_element::Data   > data );
+	EStatus checkNumber( std::shared_ptr< basic_element::Number > number );
+
 private:
 	std::shared_ptr< basic_element::Element > _element;
 };