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If many people are working in same automation project, then DP will create maintenance issue. In this case we can use Object Repository to avoid any duplicate test objects.
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This makes little sense to me; if you are duplicating object defs in a DP file then a team can just as easily duplicate them in the OR. As a matter of fact the DP flat file is must better in that you could more easily put this file under source code control (like ClearCase) and designate it for "single locker" priveledges only.