The Treatment Integrity Planning Protocol (TIPP) provides a structured process for collaboratively creating a treatment integrity assessment within a consultation framework. The authors evaluated the effect of the TIPP on the implementation of an intervention designed to improve the consistency of students' mathematics performance. Treatment integrity was assessed via permanent products and teacher self-report assessments resulting from TIPP completion. Results showed that (a) 3 teachers' treatment integrity declined within the first week of implementation and increased subsequent to completion of the TIPP, (b) teachers accurately reported their level of treatment integrity, and (c) the relationship between treatment integrity and student outcomes was unclear. (Contains 2 tables, 1 figure and 1 footnote.)