Which makes a popular and successful university book, by:
Simplicity of style so that the idea can reach the student easily and without complexity, with increasing images and diagrams that illustrate the process in an easy manner as well as keep up with the recent developments of the subject of the book ..
What makes the book more popular among university students and more successful is its attractive style, simple language and scientific topics. Best Regards
Thank you all for your informative and constructive answers. Any additional comments or extra views would still be highly appreciated, for I think many university staff members could be involved right now in writing such textbooks, and many more students are waiting for them.