Background. There are no specific tools to evaluate functional performance that accommodate the special needs of children with pervasive developmental disorders (PDD). Method. Pediatric occupational therapists in Quebec were surveyed to identify assessments that are currently being used, the modifications made, and the use of results for treatment planning and service recommendations. Results. Results from 59 therapists treating children with PDD indicated that 52 different assessments, both standardized and non-standardized, were used. Standardized tests were used infrequently and were rarely administered without modifications. Equal weight is attributed to the results from standardized and non-standardized tests and clinical observations for the purpose of treatment planning and services. Practice Implications. This study highlights the need for practice parameters that would guide the assessment process and create a consensus among therapists and practice centres.