That's good to know so I can make the adjustments once version 3 comes out. For the moment, even though I know I shouldn't have gaps, I'm thinking I"m going to need to do a little math like adding or subtracting 0.001 to my values to get the results I'm expecting. My data is to 2 decimal places, so I think it will work out OK.In the meantime, I found the reference I was looking for, not under the API reference, but under the Concepts: http://help.arcgis.com/en/webapi/flex/help/index.html#/Symbolizing_graphics_with_renderers/017p00000... "Any value that is greater than or equal to the minimum will be included in the break. Any value that is less than the maximum will be included in the break. Consequently, if you have two breaks, 0???10 and 10???20, the value 10 would fall in the second break (10???20). "