Research on emotion regulation (ER) has largely focused upon two related lines of inquiry: ER frequency and ER success. First, research on ER frequency has focused upon the relationship between how often individuals attempt to use ER strategies in everyday life which is typically measured by subjective reports on questionnaires and interpreted as trait ER. Second, research on ER success has focused on the degree to which experimentally instructed use of different strategies results in change of one or more measures of affect as measured by relatively objective measures. Therefore, distinctions between ER frequency and success are very often confounded by time scale (ER frequency measured in the long-term, ER success measured in the short-term) and methods (ER frequency measured with subjective questionnaires, ER success measured with more objective affective variables). I offer examples from the literature on ER and offer suggestions for ways to uncouple ER frequency and success from the methods that are currently being used to measure them. Clarity on the distinction between these constructs should lead to the most appropriate interpretation of results from current studies and more precisely inform clinical interventions that target one or more ER process.Although research in human emotions has been popular for several decades, research on how we are able to control our emotions, or emotion regulation (ER), has received a steep increase in attention over the past 15 years (Gross, in press). Research on ER refers to the fact that we are not merely passive conduits of emotional responses and specifically outlines processes by which we influence the onset, offset, magnitude, duration, intensity, or quality of an emotional experience (Gross & Thompson, 2007). The widespread interest in ER may be due to the fact that ER seems to be of interest to many subfields of psychology. More specifically, ER can be described as poised between two psychological research traditionsthose that describe stable traits and those that characterize the effects of dynamic processes. On one hand, researchers interested in ER as a stable trait have focused upon measuring individual differences in the use of different ER strategies and describing how these individual differences are associated with important outcomes. Other researchers have made it a priority to describe the effects of ER processes in terms of measurable affective changes when ER processes are used, and the set of circumstances under which those processes are optimized. Although these two traditions have had a few points of contact, much research on ER has largely addressed either ER as a long-term trait variable or ER as a relatively brief cognitive process. 1