A refresher training course can help maximize return on investment in employee training by preventing knowledge and skills from being forgotten over time. Learning occurs quickly initially but then knowledge is gradually unlearned unless maintained. A refresher refreshes and builds on existing knowledge and skills through activities like case studies and experience sharing. It helps employees stay productive and prevents issues like poor communication, inefficiency, and dysfunctional teams. Refreshers typically last 1-2 days and cost $1,500 per day plus expenses. Evaluation occurs 3-6 months later to assess impact.