1. existing knowledge is still scattered, according to government documents, textbooks, Web sites, or the person (the smell Monday, green growth, 2548 (2005))2. knowledge or information that may be what's going on from your personal insight. Lack of auditing firm Existing data may not meet the tolerance is true.3. a certain knowledge of the subject is regarded as a valuable knowledge but cannot be transferred or understandable by others, people may have access to the knowledge (knowledge management in the new version of executives view, 2548 (2005)) Mainly because they live together, only the followers or the people in the House only. May have been spared major doesn't want to convey to others.4. how to apply technology to help convey practical skills and low-level EEK Ranat despite technology has helped, for example, create a Web site, e-learning, or even published, but it still has many restrictions on, for example, on the subject of how to convey. Assessment or duration of study, etc.5. teaching and learning formats, most of the Bay is the patha, or private instruction (ron sansani, suvarnabhumi is 2532 (1989)), especially for a single song. There are also restrictions on does not make the able to learn manually. Want to learn with teachers only.
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