BHOLD Model Generator Membership Roles

Hi,

I am trying to run BHOLD Model Generator for Role Mining for about 1600 users. I have used a 3 file input for loading the data in to Model Generator and when I run Membership Role in the wizard, it is generating over 2500 Membership roles. When I check the details randomly, there are neither permissions nor users for most of the membership roles. However there are certain membership roles that match the criteria that I specified (95% of departments with minimum of 10 users). 

I would like to know if there is any criteria that I missed out specifying which has resulted in creating more membership roles? Or is there any way to reduce the membership roles that Model Generator creates?

Has anybody faced this situation? Any help provided is appreciated !!

Thanks

Kris

Kris