About Book
You will find the material in this book presented in a different way than you are accustomed to in an ordinary textbook. The first thing you will notice is that you are given only a small amount of information at a time, then immediately asked an appropriate question to help you find out how much you have understood, just as an individual tutor would do. The answer you select in each case determines the item of information you will be given next; hence your route through the course. This is a special kind of self-teaching technique known as programmed instruction.
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