Credit risk scoring model types - Pooled Models

[Bernardo]

Hi,

I am little bit confused with Crouhy's definition of "Pooled models", i.e. These models are built by outside vendors, such as Fair Isaac, using data collected from a wide range of lenders with similar credit portfolios. For example, a revolving credit pooled model might be developed from credit card data collected from several banks.

Just to confirm the concept: do banks really share information about their portfolio to vendors that eventually develop models for competitors?

Thanks,

Bernardo