THIS SIXTH VOLUME OF AN EIGHT-VOLUME STUDY ADDRESSES THE PROBLEM OF COLLECTING VALID DATA TO FORECAST MANPOWER NEEDS, RECOMMENDS THAT SUCH DATA COLLECTION BE MADE A CONTINUING FEDERAL PROJECT, AND THEN USES DATA COLLECTED FROM THIS SPECIAL NATIONAL MANPOWER SURVEY TO DEVELOP A FORECASTING MODEL. THE SURVEY WAS INITIATED DUE TO UNAVAILABILITY OF BASE FIGURES FOR SUCH A FORECAST. MORE THAN 8000 ADMINISTRATORS WERE SURVEYED IN DEPTH, A CENSUS BUREAU STUDY WAS ANALYZED, AND A VARIETY OF SOURCES WERE STUDIED FOR TRENDS. THIS DATA COLLECTION IS DESCRIBED IN DETAIL. A SERIES OF 27 TABLES SUMMARIZES THE FINDINGS OF THE MODEL, PRESENTING FORECASTS OF PERSONNEL NEEDS FOR POLICE, COURTS, AND CORRECTIONS UNDER A VARIETY OF BUDGET CONDITIONS. APPENDED MATERIALS INCLUDE A SUMMARY OF THE MATHEMATICAL THEORY BEHIND THE DEVELOPMENT OF THE MODEL, THE NATIONAL MANPOWER SURVEY (NMS) MODEL USERS GUIDE, AND A DATA COLLECTION SURVEY MANUAL BASED ON THE NMS-NORTH CAROLINA PROJECT. FOR RELATED VOLUMES IN THIS SERIES, SEE NCJ-43739, V.1 'SUMMARY REPORT'; NCJ-43760, V.2 'LAW ENFORCEMENT'; NCJ-43740, V.3 CORRECTIONS'; NCJ-43741, V.4 'COURTS'; AND NCJ-43742, V.5 TWO PARTS CRIMINAL JUSTICE EDUCATION AND TRAINING.'