The Iowa Oral Performance Instrument (IOPI) objectively measures: -tongue strength and endurance -lip strength and endurance These measures aid professionals involved in the treatment and study of disorders affecting swallowing, speech, and eating by: -objectively documenting deficits that justify treatment -diagnostically differentiating between muscle weakness and problems of motor control -providing biofeedback during isometric oral motor exercise programs -motivating patients by showing them their progress from muscle exercise therapy