The multiple baseline single subject design study with replication across three participants in a public-school setting. The 15-week independent variable will be a direct service occupational therapy intervention, combined with teacher consultations, based on the STAR (Sensory Therapies and Research) Frame of Reference. Frequently measured dependent variables, as the main determinants of change resulting from the intervention, will be student's video-recorded performance in the areas of functional regulation and active participation in the classroom, as rated by a trained observer. Findings of the single subject study will be corroborated via semi-structured interviews with the student participants and their teachers, administration of systematic assessments and Goal Attainment Scaling.

Inclusion Criteria:

1. Student has a) suspected sensory processing challenges and b) difficulty with functional regulation and active participation in the classroom.

2. not remediated by Tier 2 intervention

3. Evaluation finds:

   1. total score, or 3 or more scales, for the main classroom on the Sensory Processing Measure are more than one standard deviation, namely is in the some problems or definite difference range,
   2. clinical determination that the student demonstrates disrupted sensory processing issues that are impacting his or her ability to participate in the school setting, and
   3. student requires specialized intervention in the form of direct pull-out service delivery in order to access his or her education.

Exclusion Criteria:

1. The student has an autism diagnosis or a primary genetic, orthopedic, or neurological disorder.
2. The student is participating in occupational therapy outside of school.