THE STUDY DRAWS ON THE WORKING PRODUCTS FOR FOUR PHASE I STUDIES -- INMATE AFTERCARE (HALFWAY HOUSES), PRETRIAL RELEASE, INTENSIVE SPECIAL PROBATION, AND JUVENILE DIVERSION -- TO EXPLORE THE FURTHER DEVELOPMENT OF APPROACHES FOR COLLECTING, ORGANIZING, AND ANALYZING DATA IN PHASE I STUDIES. THE REPORT DESCRIBES AND PRESENTS EXAMPLES OF THE MODELING TECHNIQUES AND CONVENTIONS USED IN THE FEASIBILITY STUDY, AND DISCUSSES HOW THE APPROACH DEVELOPED CAN BE USED IN PHASE I STUDIES TO REPRESENT INTERVENTIONS AND ISSUES, ORGANIZE MATERIAL AND FILES, SYNTHESIZE INFORMATION, DEVELOP TYPOLOGIES, AND DESIGN EVALUATIONS. TEST APPLICATIONS OF THE APPROACH INDICATE THAT IT IS FEASIBLE TO DEVELOP MEASUREMENT MODELS TO REPRESENT SPECIFIC TYPES OF ACTIVITIES FOR ANSWERING SPECIFIC QUESTIONS. RECOMMENDATIONS FOR USING THE APPROACH DEVELOPED AND TESTED IN THE FEASIBILITY STUDY TO IMPROVE FUTURE PHASE I STUDIES ARE PRESENTED. ANNEXES A, B, C, AND E ARE CONTAINED IN A SEPARATE VOLUME (NCJ-45264). (LKM)