This paper reviews the Sensory Integration and Praxis Tests (SIPT) (Ayres, 1989b), including its history and development, standardization, reliability, validity, and interpretation. Based on decades of theory development and earlier standardized tests, the SIPT represents a sound assessment tool for the evaluation of sensory integration and praxis in children. The SIPT's implications for the field of occupational therapy are important and widespread. This article serves as an introduction to other papers in this issue that have used the SIPT as a research tool.