"Your programmed text is quite different from an ordinary book. A program consists of a large number of "frames," or numbered statements, each of which tells you something and asks questions about the material you have learned. The frames introduce new material a little at a time and review old material as needed to make sure you will remember it. You do not study a program in the same way you study a book. The program is designed to let you work at your own rate of speed. Get ready to use your program by covering the answer column at the right with the slider provided for you. Next, read the first frame and write the answer either in the blank or on a separate piece of paper..." [from book "to the student"]