If your interest in Chaos was piqued by Gleick's book on the subject, you may have found it unsatisfying. While it conveyed a enthusiasm for chaos, it only superficially answered questions about what characterizes a chaotic system. "The Essence of Chaos" is a much better book for gaining an understanding of chaos, mainly because it includes a discussion of the mathematics. Both authors strive to avoid mathematics as much as possible, but in the end, I believe Lorenz achieves a better balance. He only touches lightly on the math, but without that, it's impossible to understand what makes a system chaotic. He doesn't quite go so far as to show a practical application of chaos theory, but a clear and concise example of that probably doesn't exist yet. But, he does achieve the goal of demonstrating and examining the fascinating characteristics of a chaotic system.