public function produce( $packetName, $articles )
	{
		if( !in_array( $packetName, $this->packets ) )
			throw new InvalidArgumentException( 'Packet "'.$packetName.'" is not a valid Packet.' );
		try
		{
			$packet	= new Alg_Parcel_Packet( $packetName );
			foreach( $articles as $articleName => $articleQuantity )
			{
				if( !in_array( $articleName, $this->articles ) )
					throw new InvalidArgumentException( 'Article "'.$articleName.'" is not a valid Article.' );
				for( $i=0; $i<$articleQuantity; $i++ )
				{
					$volume	= $this->volumes[$packetName][$articleName];
					$packet->addArticle( $articleName, $volume );
				}
			}
			return $packet;
		}
		catch( OutOfRangeException $e )
		{
			throw new OutOfRangeException( 'To much Articles for Packet.' ); 
		}
	}