According to Wood, Bruner and Ross (1976 years) he says, "scaffold" refers to a behavior supported by the expert support, allowing novices to perform tasks, solve problems or achieve his or her goals can not be achieved. They define it as a process, "the child or novice to solve a task or achieve a goal beyond his own efforts." (1976: 90). As they pointed out, the scaffolding needs adult control tasks, understand the factors that go beyond the initial scope of the study. So that students only concerned about the ability of these factors are within the range.
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