Reading Usable Help
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Gordon R. Meyer
Interactive Word command reference
Microsoft has an interesting command reference tool for users switching from Word 2003 to Word 2007. It mimics the Word interface and, as you choose commands, shows and tells you where the command is located in the new interface. This takes advantage of the users spatial and visual memory for frequently-used commands, but it strikes me as overly comprehensive--a common tech writing mistake--because it also includes commands that have not changed between the versions. In that scenario, it seems unlikely that a user would refer to this tool at all.