The document discusses the differences between teachers, trainers, facilitators, and coaches. It also discusses difficulties adult learners may face and principles of adult learning. Specifically, it states that a teacher transfers knowledge through lectures, a trainer transfers knowledge and practical experience through sessions and examples, a facilitator moderates sessions where knowledge is shared by participants, and a coach asks questions to extract ideas and decisions from others. It also lists shy behavior in groups, slow awareness of theory, weak listening/observation skills, and lack of self-confidence as difficulties adult learners may face, and notes adults learn best when subjects meet their needs, through doing and experiences, and by solving problems relevant to their lives.