The effects of self-monitoring (SM) on teacher behavior are well documented, but previous research does not attempt to control for reactivity as a threat to internal validity. This study examined the effects of a multicomponent SM intervention on the use of a classroom management practice with participant masking to address this absence in the literature. Participating teachers selected between two practices (behavior-specific praise and opportunities to respond). A multiple baseline design across four pre-service teacher interns occurred in general education classroom settings. Participant masking to the purpose of the study precluded exposure to SM, performance feedback, and goal setting. Analyses included an independent visual analysis by three masked raters, an independent quality review for What Works Clearinghouse standards, a nonparametric statistical analysis based on data characteristics, and correspondence reporting between visual and statistical analyses. Overall results indicated an increase in the rate of classroom management practice use by the participants and good social validity across the three constructs. Student outcome data for on-task behavior were inconclusive. Limitations and implications for research and practice are discussed.