Individuals’ personal improvement efforts are pervasive and the benefits associated with successful self-improvement are both tangible (e.g., healthier lifestyles, more intimate relationships) and intangible (e.g., personal accomplishment, enhanced well-being). As evidenced by research on work-family spillover, self-improvement also has important implications for organizations, as there is considerable crossover between work and non-work domains. The current study tested the effectiveness of Truly Accomplished, an intervention designed to help individuals develop personalized systems for measuring and improving behavior, and examined the extent to which the outcomes associated with such behavior change exhibit positive spillover effects into the workplace. Participants (N = 44) experienced large gains in effectiveness (d = 2.93). Effectiveness gain was predicted by conscientiousness (r = .40), core self-evaluations (r = .42), and psychological safety (r = .64). Learning goal orientation and performance goal orientation interacted with perceived goal difficulty to predict effectiveness gain. Overall effectiveness gain was negatively related to stress and positively related to future change efficacy, job-related efficacy, and satisfaction with the intervention. Job satisfaction and job efficacy increased following feedback, providing some evidence of spillover. Results have implications for individual behavior and attitude change, and its impact seems to extend into subjective well-being above and beyond actual behavior change. Evidence of spillover has implications for organizations, suggesting that TA may be used as a mechanism through which job-related outcomes can be improved
