This book contains twelve small chapters on the adequate design of technical devices, the design of good and foremost well usable "user interfaces". Each of these chapters is a fast read (maybe half an hour), but contains enough substance to fill an entire book of good quality.
It is always good to remind oneself in regular intervals, of what excellent quality means. This book helps you.
I read it from the perspective of a software developer. After reading this I now think, that I really do finally understand the importance of use cases (see Ivar Jacobson). Before I was reading a book by Kent Beck on Test Driven Development. Also here the Jenson Book sheds extra illumination. A test is a use of a program.
You might find the book expensive for so few pages. These pages are more than worth it.