SIGN is made up of a group of volunteers who are dedicated to protecting the integrity and promoting the work of Dr. A. Jean Ayres in Sensory Integration Theory and Intervention.The originators of this group include former co-workers and students of Dr. Ayres, who are now among the leading experts in the field, and occupational therapists committed to providing occupational therapy services from a sensory integrative perspective in a manner consistent with Ayres’ core principles. In addition to the support of the Successor Trustee of Dr. Ayres’ estate, who now holds the trademark term Ayres Sensory Integration® (ASI), participation at the ground level has also included businesses who manufacture tests and equipment related to sensory integration.