I am currently working on an RFP that will result in in the award of up to two (2) Indefinite Delivery – Indefinite Quantity (IDIQ) contracts. We would like to award this requirement on an all, some or none basis to either a single source or multiple sources through a full and open competitive process. I am working on Section M and the Source Selection plan and not sure if we are doing all, some or none would we still use best value for the basis of award? I'm not sure if this makes things more complicated but we are also evaluating the Offeror(s) in two parts.