"The DoD team that conducted the Bottom Up Review (BUR) took on a very substantial task. The BUR team was appropriately composed of all relevant OSD offices and the services. This Defense Science Board Task Force conducted an independent assessment of their effort. The limited time available required the BUR team to focus chiefly on a comparison of tactical aircraft as stand alone air warfare assets. The process included six main avenues of analysis: costing, affordability, industrial base and threat assessments, a PA&E qualitative assessment, and an Institute for Defense Analysis (IDA) cost-effectiveness comparison model."
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/