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One of the most widely used standards for estimating projects is in Dr.
JoAnn Hackos' book, "Managing Your Documentation Project." See page 170
for more on the following estimates:
user guide 5 hrs/page
software app. ref. man. 4 hrs/page
hardware maint/troubleshooting 8 hrs/page
classroom training 40 hrs/deliverable hour of training
context-sensitive help 4 hrs/topic of help information
comprehensive help 4 hrs/topic, including hypertext links
videotaped instruction 30 hrs/finished minute production time
CBT 60 hrs/finished hour of training
These are good for fairly standard projects, without a whole lot of
developers changing their minds, GUIs changing at the last minute, etc.
However, as we all know developers are notorious for changing how things
work, how they appear, even key definitions. Changes late in a project
will throw off all sorts of estimates.