In this comprehensive review, 32 studies were identified in which researchers investigated the effect of real-time performance feedback delivered via technology on interventionist implementation of instructional practices. Studies were evaluated for methodological rigor with quality indicators from the Council for Exceptional Children. Twenty-two single case designs and one group design met all quality indicators. The single case designs were analyzed using visual analysis and given success estimates calculated as a ratio of the number of demonstrated effects to potential demonstrations of effect. Methodologically sound evidence indicates that real-time performance feedback is an evidence-based practice for changing interventionist behavior during intervention sessions. Implications for research and practice are discussed.