New answers tagged aggregation
What i Understand that you make a decision between seprate List or views. Here is you requirement what i get. No unique permission 12 Groups only Not too much List items I would go with one List so that keep things simple. I will have atleaset two Column, one for Group name and 2nd for the Project name/number. Both can be MMS columns. I will build views ...
Normally each Project will have their own site where project members can collaborate. It should have a task list, document library etc. Now from your use case using a single list is not a good idea, because as more projects are added the list will grow and the unique permissions grow. This make bad performance as well as clutter the navigation.
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