This research examined frequencies of error-bias as an index of internalization (Ratner, Foley, & Gimpert, 2002) as third grade children performed an "errand task" pre-test, collaborative session, and post-test (Radziszewska & Rogoff, 1991). To examine the degree of error-bias, the task in the collaborative session was divided into three activities (planning, determination, and execution), based on the sequence of problem-solving activities. The results showed that error-bias was observed in the determination activity, and those participants who showed error-bias ("bias group") in the determination activity improved the most in their performance. These results suggested that the bias group internalized an effectual strategy to find the shortest route to a solution, and consequently used this strategy on the post-test. In addition, qualitative analysis showed that in collaborating with others, children in the bias group found the effectiveness of self-corrective activities. They reexamined the better route themselves before making a final decision, and used such self-corrective activities in their collaborations.
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