Model design

Dear Experts,

We have a requirement of building min 25 Balanced Scorecards with around 1000 KPIs.

Each Context has 25 to 50 KPIs which source comes from Entry & Approval, BW and BPC.

How many models should be created in the PAS server for Entry & Approval, BW and BPC.

What are the performance Issues need to consider while designing one model for all Entry & Approval.

Coming to BW KPI's comes from different queries, how to design the no of models.

One Context is assigned to one model. What if the measure which is in other model is required?

How do we design the one context who's data come from different sources like E&A, BW and BPC.

I am familiar with designing 1 model which is used for one context.

Please can you help me with the design.

Thanking you,

Regards

Vinay.