Documenting treatment integrity is an important issue in research and practice in any discipline concerned with prevention and intervention. However, consensus concerning the dimensions of treatment integrity and how they should be measured has yet to emerge. Advances from three areas in which significant treatment integrity work has taken place--psychotherapy, substance abuse treatment, and prevention science--are summarized and integrated with recent advances in treatment integrity in school psychology. Innovations discussed include broadened models of treatment integrity, generic treatment integrity measures that assess common and unique elements of multiple interventions, and experimentally validated strategies for enhancing treatment integrity. Building on innovations across disciplines is one means for advancing treatment integrity technology in educational settings. (Contains 1 table.)