Certain conditions. I subscribe to the minimal architecture paradigm...the least complexity to perform the task is the best.

>>And this is why I stick with what I said before......if you have an object that exposes attributes, changing the attribute fires Assign which can REPLACE and other stuff.
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>Ok! I finaly got the last sentence of your oginal reply, the A/A should be done on the data object, not the UI (I messed my thinking up bad!) Doh! Doh! Would you suggest Middle Tiers components in every app then, or is this where the certain conditions comes into play?