Ostensibly, this book covers the subject of creating web-based educational courseware thoroughly; however, it is mostly geared towards university distance learning (including hypbrid uses), which I found of limited use to those in military or corporate training development. The basis of the information, where each chapter is written by a different author, ranges from tenets based on primary research, to those based on extrapolation from text and CBI research, to "common practice" and personal experience (but written as though the truth). Very little information is based on primary research for web-based instructional design (including interface issues), although each chapter has a long bibiography. Also, this is one of the worst-edited books I've read in a long time, though the first chapter is the killer. If you're new to the subject of distance learning and you're in K-12 or higher education, it may be useful to you. Else...is there "else"? I'm still searching.