I'm a technical writer by profession, and taught technical writing for 10 years. I've used this book and Day's "How to Write and Publish a Scientific Paper" as textbooks, as well as in the workplace. This is the most succinct, practical, and helpful guide for scientific and technical writing on the market -- and I've looked at an awfully lot of guides! It's easy to use, and often very funny. Also, it's a good example of the clarity and brevity he advocates (this is not, unfortunately, true of many technical writing textbooks). Finally, I heartily concur with Day's belief that "Simplicity of expression is a natural result of profound thought." I've heard many scientists deplore the poor state of scientific education in the U.S. and the rise of "bad science." In my opinion, this is the fault of scientists themselves for not making their methods and results more accessible to the general public. Day's guidelines are an important step in the right direction, and I hope more scientists follow them.