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This study examined the development of the thinking strategy that leads to the conclusion that not every simple problem has a simple solution (indetermination). The development of this strategy was examined by studying the developmental process of indeterminate conditional reasoning, using the following three conditionals: categorybased, causal, and deontic. The experiment was conducted with a total of 100 children between late four and early six years of age. First, the children weredoi:10.4992/jjpsy.79.1 pmid:18516952 fatcat:wbtpxbu34bdqrevm5odbfvpk7y