Knowles emphasizes that adults are self-directed and expect to take responsibility for decisions. Adult learning programs must accommodate this fundamental aspect.
Andragogy makes the following assumptions about the design of learning:
(1) Adults need to know why they need to learn something.
(2) Adults need to learn experientially.
(3) Adults approach learning as problem-solving.
(4) Adults learn best when the topic is of immediate value.
In practical terms, andragogy means that instruction for adults needs to focus more on the process and less on the content being taught. Strategies such as case studies, role playing, simulations, and self-evaluation are most useful. Instructors adopt a role of facilitator or resource rather than lecturer or grader.
See the article from Instructional Design here: https://www.instructionaldesign.org/theories/andragogy/