Conceptual Design

Yes, Conceptual drawings are used from starting era to nowadays too in engineering. For instance, Conceptual drawing are used by architects, engineers and interior designers as a quick and simple way of exploring initial ideas for design as in the form of Conceptual drawing, sketches, free hand drawing or elsewhere as rough design. Most of the companies and industries prescribed/ advised designers to rough draft the concept of the product design to develop before goes for 3D CAD but its not compulsory.