Design study. Here, the requirement information gathered earlier is used to guide design concept development and evolution. The aim is to extensively explore and brainstorm ideas and concepts until the best is found for development. During this design process, many disciplines are employed from practical model making to freehand drawing for design studies, problem solving, meetings and Industrial Design to complex computer software for Engineering Design and simulation. Suppliers are often involved at this early stage to help build involvement and tap into a flow of ideas. It also helps to avoid expensive and time consuming changes later.