The path from design concept-

A final acceptable design is a long and winding one. The development phase of the design process consisits of putting the major elements of the concept togetherkeeping in mind that the resulting product should satisfactorily perform the expected functions. However, the acceptability of a product does not depend entirely on its functional utility or efficiency. A product needs installation, operation, maintenance and repair. The effort needed and the attention required for these functions are important determinants of the quality of the product as it appears to the user. To this end, therefore, the designer must build into the design, ease-of-use, installation, maintenance and repair. All these considerations constitute the preliminary design stage of the design cycle.