In pediatric occupational therapy, there is insufficient evidence examining assessment tool selection by occupational therapists and how assessment tools contribute to occupation-based practice. To examine the perceptions of occupation-based assessment tool selection by pediatric occupational therapists, a phenomenological research study was conducted with six pediatric occupational therapy practitioners. Three themes emerged from participants’ perspectives: the centrality of occupation, selecting the just right tool, and practice implications. Participants recognized the need to integrate occupation-based assessments into practice but reported decreased opportunities secondary to training, available supplies, lack of awareness of foundational constructs, and organizational expectations. The use of occupation-based assessments positively enhances pediatric occupational therapists’ clinical practice by upholding the core occupational beliefs of the profession throughout all phases of service delivery.