A key task of the engineering designer is decision-making. At every stage and at every level in the design process, choices have to be made which will determine the ultimate success or failure of the product and vitally influence company profitability. With the complexity of todays engineering products, it is no longer possible for the designer to rely on an innate decision-making ability. This book increases awareness of existing techniques and help to improve the quality of decision-making. Linking company profitability and product success with the decision-making process, it presents a systematic approach which can be applied at each design stage, from determining end-user requirements through to design detail.