Engineering Is Not Science 16 years ago
A good book on this topic is "Designerly Ways of Knowing" published by Birkhauser. It defines Design as a third discipline, distinct from Humanities (which deals with the human experience) and Science (which deals with the natural world). Design with a capital D meaning anything related to creating new things, usually with technology.
The book goes on to explain how the three disciplines differ as per the skills required to practice it: scientists need analytical thinking, designers need synthetic thinking.
You learn this by page 10. The rest of the book is just as interesting as its first chapter.