Project Server Portfolio Modeller is a great tool that allows you do what-if modeling and compare your resource capacity against project demands. With Portfolio Modeller you can create different scenarios ("what will happen if we start projects A and B next month?", "what will happen if we start projects A,B and C this month".) and later compare them. The problem is that Project Server saves a model once you change any parameter and don't have to click Save to apply changes - all changes in model are saved automatically. So it may not be that easy to rollback to the original state of scenario you are analyzing.
CopyModel add-on allows you to save model at any state when you working on it and later compare different saved states. This makes comparing models easy and significantly enhances your analysis opportunities.
Requirements:
Windows 2003 Server
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