How do we know who should receive what intervention? Or who will react in a certain way to a given stimuli? Psychology deals with many matching effects whereby individuals have different reactions contingent on their personalities, and these differences are typically operationalized as interaction effects. However, popular analyses, such as examining whether an interaction term is significant and doing simple slopes analyses (e.g., looking for differences at +/- 1 SD on a continuous variable) tell us little about when people shift in their reactions. We therefore propose the direct estimation of Points of Intersections (POIs) between regression slopes; thresholds along continuous variables (e.g., personality) when categorical variables (e.g., stimuli) shift in the direction of their effects. Using Monte Carlo simulation studies, we evaluate competing ways of calculating POIs and confidence intervals around POIs, ultimately recommending a bootstrap procedure. -- *Keven Joyal-Desmarais* PhD Candidate, Social Psychology Social Sciences and Humanities Research Council (SSHRC) of Canada Doctoral Fellow Administrative Assistant, Center for the Study of the Individual and Society (CSIS) University of Minnesota | N369 Elliott Hall | Minneapolis, MN 55455