The body of scientific inquiry developed by A. Jean Ayres is deeply rooted in systematic and methodical measurement, and her work marked the first effort by an occupational therapist to build a theory for clinical application with an evidence-based approach.
Maillioux, Z. & Miller-Kuhaneck, H. (2014). Evolution of a theory: How measurement has shaped Ayres Sensory Integration®. In Press. American Journal of Occupational Therapy, 68, 495-499. (Special Issue on Measurement in Sensory Integration)
American Journal of Occupational Therapy