PDARS > Approach       NASA provided both intellectual vision for the development of PDARS and significant seed money for its initial stages. The FAA Office of System Capacity has taken the system nation-wide. Success has been achieved through collaboration with FAA and NATCA personnel at participating ATC facilities. Collaboration entails an iterative process as users gain experience with PDARS and develop the customized installations at each site. The results have been enthusiastically embraced by each of the participating facilities and by higher levels of the FAA.     Networking plays a key role in the function of PDARS. Data must be accessed nationally and at each facility, analysis tools provided and maintained from a central facility, and results shared among participating facilities. The network enables routine daily tasks and reports. Each day, the PDARS system:     collects flight plan and radar-track data filters to insure data quality concatenates same-flight radar tracks from multiple radar installations processes and analyzes the data automatically according to needs of each facility provides customized daily performance reports to the managers of these facilities prior to their morning multiple-facility telecons.