Advantages
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1. Learners are trained to be familiar with the rule discovery; this could enhance learning autonomy and self-reliance.
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2. Learners’ greater degree of cognitive depth is “exploited”.
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3. The learners are more active in the learning process, rather than being simply passive recipients. In this activity, they will be motivated
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4. The approach involves learners’ pattern-recognition and problem solving abilities in which particular learners are interested in this challenge.
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5. If the problem-solving activity is done collaboratively, learners get an opportunity for extra language practice.
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Disadvantages
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1. The approach is time and energy-consuming as it leads learners to have the appropriate concept of the rule
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2. The concepts given implicitly may lead the learners to have the wrong concepts of the rule taught.
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3. The approach can place emphasis on teachers in planning a lesson.
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4. It encourages the teacher to design data or materials taught carefully and systematically
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5. The approach may frustrate the learners with their personal learning style, or their past learning experience (or both) would prefer simply to be told the rule.
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