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Part 1 Distance education and lifelong learning: the idea and evolution of distance education how distance education serves adult learners. Part 2 Strengths and limitations of current practice: key approaches to distance education delivering programmes to learners assessing programme quality and effectiveness. Part 3 Strengthening the theory and practice of distance education: programme foundations teaching and learning organization and administration conclusion - opportunities and challenges for the future.
Moore et al. (Wed,) studied this question.