This textbook for engineering students provides an introduction to design for function, using many examples of manufactured artefacts and living organisms to demonstrate common themes and fundamental principles. Examples forcefully illustrate the importance of the basic design principles related to materials, energy and information. The author also discusses the relation of aesthetic and functional design, the crucial relation of design to production in artefacts, and reproduction in organisms. The book concludes with a brief summary of the role and requirements of designers and inventors. This second edition has been extensively revised, with more examples and a new chapter with actual design case studies to illustrate key ideas. In addition, many exercises have been added to help reinforce important points in the text.