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The purpose of this study is to investigate which factors affect problem solving processes and psychological traits of these factors during problem solving. The study selected 6 samples from 5-th & 6-th grade students, and classify them by low, average, high abilities ,and used non- synchronic thinking-aloud method to obtain problem solvers'''' information in short term memory during problem solving processes. The study designed a model of five components of mathematical problem solving processes that are used analytical framework. According to these components, the findings of the study have: 1. Perception, understanding and representation of the problem. (1) High abilities tend to observing relations of problem context and evaluating availability of these relations , but low abilities only tend to perceiving single or few relations. (2) To the same problem, different problem solver often formulate different and various meaning. (3) To low abilities, it is enough to assist him successful problem solving by making a graph or a diagram. 2. Understanding of math concepts. Low abiities tend to apply some similar context or keywords of the problem, and math knowledge of low abilities is often formula for incantation or surface understanding. 3. Design and perform strategy. Effective problem-solving strategies are almost from high abilities. 4. Awareness and control. Awareness can be distinct from five levels: unawareness; unrelational awareness; unclear awareness; relational awareness; reflective awareness. 5. Looking back. Problem solvers of the study have few looking back. In particular, average or low abilities often reprent them to dislike check or unknow how to check.
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