This document discusses training evaluation and measurement. It defines key terms like training effectiveness, outcomes, and evaluation. It describes the reasons companies evaluate training, including demonstrating returns on investment. Formative evaluation involves collecting feedback during program development, while summative evaluation determines post-training changes. Common outcomes measured are reactions, learning, skills, attitudes, and results. Various evaluation designs aim to control for threats to validity like pre-post tests with comparison groups. Calculating return on investment involves determining costs, benefits, and the ratio of returns to costs. Practical challenges include isolating training impacts from other influences.