Of critical importance is timely updating. The workbook must be current. This is very difficult to do if whole documents must be retyped for changes. In a looseleaf book, however, only pages need to be changed. We had available a computer-driven text-editing system, and this proved invaluable for timely maintenance. Offset masters were prepared directly on the computer printer, and turnaround time was less than a day. The recipient of all these updated pages has an assimilation problem, however. When he first receives a changed page, he wants to know, "What has been changed?" When he later
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