Train-the-trainer is a methodology that develops the skills and knowledge of individuals who will be responsible for training others within an organization. This approach focuses on equipping these individuals, often subject matter experts or experienced trainers, with the necessary instructional techniques, materials, and strategies to effectively convey information and facilitate learning among employees.

Example
In a train-the-trainer program, seasoned customer service representatives are trained on how to effectively instruct new hires on the company's customer service protocols, ensuring consistency and high-quality training across the team.