How would one do it today? With today's system technology available, I think the technique of choice is to keep the workbook on the direct-access file, marked with change bars and revision dates. Each user would consult it from a display terminal (typewriters are too slow). A change summary, prepared daily, would be stored in LIFO fashion at a fixed access point. The programmer would probably read that daily, but if he missed a day he would need only read longer the next day. As he read the change summary, he could interrupt to consult the changed text itself.
