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I joined a MS Access database table to a GIS file. When I try to use symbology (categories) to represent a yes/no value which is in the table file (0/-1) it does not recognize it as a value.

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What's the specific error you are getting? Is the Access file open at the time? – nagytech Jan 16 '13 at 20:15
Perhaps outline the exact steps you have taken. What type of "GIS file" are you using? What field type are you using to store "0" and "-1"? – PolyGeo Jan 16 '13 at 22:23

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