This federally funded project was designed to achieve three goals: (1) to test the effectiveness of an individualized behaviorally based developmental approach to providing early intervention services to very low birthweight preterm infants (and their families) in the newborn intensive care unit (NICU); (2) to evaluate this approach with low-risk, never ventilated preterm infants cared for in a special care nursery (SCN); and (3) to examine the professional and organizational structures necessary to implement this care model. Four NICUs and one SCN collaborated in the project. Differences between experimental infants and controls up to age 9 months are reported for medical outcomes, neurobehavioral outcomes, and family functioning. Results strongly supported the early intervention. The analysis of organizational structures found that such an intervention model requires a process-oriented relationship-based approach. Individual sections of this final report present the project's goals and objectives, theoretical and conceptual framework, methodology, findings, impact, and future activities. Tables and figures detailing the study's findings are appended, as are instruments used in the organizational analysis. Also attached are forms used for consultation with implementation sites, forms for consultation with individual trainees, forms for site assessment and trainee self-assessment, copies of several papers resulting from the project, and copies of additional instruments. (Contains 32 references.) (DB)