Simplicity is a key features in almost every design project. This book offers a set of terms that will allow us to discuss simplicity in design with precision. There are only a few books discuss and show simplicity from a designer's point of view. As the world becomes increasingly complex and complicated, simplicity becomes increasingly in demand. We all seek simplicity in small or large measure. We strive to create simplicity at work and at home. While the lives of our early ancestors may appear simple to us, it would not be simple for us to live those lives. This takes us to the root of simplicity: Simplicity is not an absolute quality. It depends on our experience, knowledge, understanding, and skills.