When using ArcGIS, it's not always possible to name a given piece of data in a way that retains all the information on how it was generated--what the inputs were, how raster values were calculated, etc. Ideally, a log would be kept to document this sort of information.
Another option is embedded right in Arc: the Results pane. If you save the .mxd after every process you run, all the information you need is retained there.
(It's probably still good to keep a log for important data, especially if files might be moved or renamed.)
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