my prototype was on cars which helps alot to study the design of a particular car..Today, we can observe that we are surrounded by machines and each of them is destined to assure a need of our society. Each of them exists in different sizes from an airplane to a mobile phone. We have always understood that these machines have been created by passing a complicated engineering process. It is true that sometimes many of them are manufactured by validating a long chain of reflection, high technology conception, design, tests and etc. This concerns particularly cars which became an essential element for our society and a part of our life depends on these machines. As regards cars uses, they enable people to move from a point to another point and they also provide several advantages such as saving money, energy, time.