According to the renowned American educator, Malcolm Knowles there are 5 assumptions concerning the characteristics of adult learners, and 4 principles concerning adult learning (andragogy). Despite the fact that Knowles' adult learning theory assumptions and principles were introduced in the 1980's, each can be utilized today to help eLearning professionals create more meaningful learning experiences for adult learners.
Interesting infographic that explains Andragogy.
In order for adult learners to be actively involved in their own learning, they must feel (and know) that they have a voice in regards to the content and delivery of their coursework. The degree to which learners determine how a course will play out is, of course, the prerogative of the instructor, but I think instructors who actively gauge the preparedness and receptivity of their adult learners are liable to get ones who are more engaged and grateful.
Scooped from Amos's Scoop.it page- Adult learning theory is very important to keep in mind when designing learning strategies for adult education. This is a very helpful resource to easily reference when designing instruction, in particular I would highlight the PURPOSE behind each module and activity and remembering that motivation is key with adult learners.