Volkswagen's GTI, Golf, and Jetta models are sophisticated examples of the state of today's automotive engineering art, blending advanced design and manufacturing to provide an outstanding combination of performance, economy, roadholding, and reliability at very reasonable cost. In spite of this sophistication, much of the necessary maintenance and repair can be accomplished by the average owner using this manual. While the complexity of the car may seem to make this a difficult challenge for the novice mechanic, it can be simplified and more easily understood by viewing the car as a well-designed assembly of simpler systems, each performing its own independent functions.