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The following assumptions underlie Knowles' (1984) andragogical model: o Adults tend to be self-directing. o Adults have a rich reservoir of experience that can serve as a resource for learning. o Since adults' readiness to learn is frequently affected by their need to know or do something, they tend to have a life-, task-, or problem-centered orientation to learning as contrasted to a subject-matter orientation. o Adults are generally motivated to learn due to internal or intrinsic factors as opposed to external or extrinsic forces.

Knowles has gradually modified his position regarding the contrast between how preadults learn (pedagogy) and how adults learn (andragogy). According to Feuer and Geber (1988), "[w]hat he once envisioned as unique characteristics of adult learners, he now sees as innate tendencies of all human beings, tendencies that emerge as people mature" (p. 33). Nevertheless, the andragogical model has strongly influenced the adult education field, with one result being the assumption teaching adults should differ from teaching children and adolescents.

CONSIDERATIONS FOR PRACTICE Is teaching adults different? Based on the literature discussed here, the answer is both yes and no. Although teachers perceive adults as being different, these perceptions do not automatically translate into differences in approaches to teaching. Perhaps a better way to frame the question is to ask "Should teaching adults be different?" According to Darkenwald and Beder (1982), "the real issue is not whether learner-centered methods are universally applied by teachers of adults, but rather for what purposes and under what conditions such methods, and others are most appropriate and effective and in fact used by teachers" (p. 153). Gorham (1985), in citing studies that identified interaction patterns of "master" preadult teachers as being less directive and more student-centered than those of "average" preadult teachers, suggests that "the most cogent prescription might be to define responsive teaching techniques as the approved practice for educators at all levels..." (p. 207). Based on these observations, some considerations for practice emerge. 1. Determine the purpose of the teaching-learning situation. The andragogical or learner-centered approach is not appropriate in all adult education settings (Feuer and Geber 1988). The decision about which approach to use is contextual and is based upon such things as the goals of the learners, the material to be covered, and so forth. 2. Provide opportunities for teachers to practice learner-centered methods. Gorham (1984) suggests training teachers in techniques especially suitable for adult students, such as small-group discussion methods, effective use of nontraditional room arrangements, and so forth. 3. Select teachers on the basis of their potential to provide learner-centered instructional settings. Gorham's (1984, 1985) study identified some characteristics of teachers who seemed to be more flexible and responsive in adult settings. However, she also suggests that more research is needed.