This book should be renamed to "WSH in 21 days for programmers".
This book is aimed at existing programmers who are familliar with Object-Oriented Techniques, contolling programme flow and error handling techniques. It does nothing to introduce the WSH environment to people who are new to computers and programming which is a real shame as scripting would be a great place for them to start.
If you are a beginner to computers and would like to learn a bit about programming and cotnrolling Windows, then do not buy this book, it assumes too much knowledge on your part and you will only get lost and confused in the terminology.
On the other hand, if you are a programmer or have a lot of programming experience and are familiar with OO techniques, then this book will serve you well in introducing the WSH environment.