In the automotive business, knowledge is key to effectively diagnose and repair today's vehicles. With the evolution of technology, auto repair has required that mechanics become technicians with an array of skills including electrical, electronic system theory, mechanical and engineering theory. He must be able to comprehend complex vehicle control systems and apply a sound diagnostic approach for an effective repair. Newer vehicles utilize extremely complex technology including multiple on board computer systems that control every aspect of your vehicles operation. Along with this technology comes the necessity for state of the art diagnostic equipment, lap top based scan tools are now the norm and require additional skills from technicians to properly use and interpret scan data.