A circumstance in which an adult is actively engaged in learning is defined as adult learning. This may be done formally in a university, vocational school, or via an apprenticeship. Adults who desire to go back to school only to acquire a certain skill set might also benefit from this approach. Andragogy, also known as the Adult Learning Theory, is the study of the ways in which adults learn, as opposed to children. It was first developed by Malcolm Knowles in 1968. It is meant to illustrate the uniqueness of adult education and help find the most effective methods of instruction. There have been modifications and expansions to the idea throughout time. It is built on four tenets of andragogy and five underlying beliefs about adult learners. It is a notion that may be used in the corporate world, since it is effective for typical training programs like those that teach soft skills.