The main purpose of the present study was to implement an experiment with a control group designed to explore the effects from external executive coaching on goal setting self-efficacy and causal attribution. The study is comprised of 20 executives at a branch of a Norwegian Fortune 500 company who all voluntarily participated in an experiment over a period of 1 year. Analyses by means of analysis of covariance show that the goal setting strategy dimension leadership self-efficacy and successful causal attributions to strategy increased in the experiment group compared to the control group. These findings are discussed based on the possible impact these variables have on performance and how external executive coaching might be beneficial for companies.