The Division for Early Childhood (DEC) recommends the Primary Service Provider (PSP) approach as the best teaming practice, but research on its core components and outcomes in early intervention remains limited. Using the DEC Recommended Practices Evidence Synthesis Group Guidelines, we conducted a systematic review to identify PSP core components and associated outcomes. An electronic database search and supplementary methods identified six correlational studies. The findings highlight six core components: forming a transdisciplinary team, designating a PSP, the use of an individual team member serving as the PSP and point of contact, delivering and coordinating services, adopting family-centered practices, and fostering team collaboration and support. Implementation of PSP practice was related to enhanced family outcomes, including family satisfaction and quality of life, particularly when family-centered practices were employed, but showed no relationship to child outcomes. Implications for future research and practice are discussed.
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