The Delft Design Guide presents an overview of product design approaches and methods used in the Bachelor and Master curriculum at the faculty of Industrial Design Engineering in Delft. Product design at Industrial Design Engineering in Delft is regarded as a systematic and structured activity, purposeful and goal-oriented. Due to its complexity, designing requires a structured and systematic approach as well as moments of heightened creativity. In this guide we restrict ourselves deliberately to approaches we teach in Delft. Although we are aware of others, they are not included in this design guide. The design guide is largely based on existing books and articles; where possible we have tried our best to refer to these works in the appropriate form. The objectives of the Delft Design Guide are threefold: 1. design students can use it as a 'first aid' in their design projects, managing their personal development of becoming a designer; 2. design tutors can use it as a reference manual to support students in their learning process; and 3. professional designers can user the design guide as a reference manual to support their design processes.