you recently were watching your younger sister, who is 13 years old, try to figure out why her cell phone was not working. you were fascinated by the systematic problem-solving strategies that she was using. you remember just a few months ago she would not have been able to perform at this level of hypothesis testing. according to piaget, what type of reasoning is she using?

The hypothetico-deductive (HD) method is a cyclic pattern of reasoning and observation used to develop and test proposed explanations (i.e., hypotheses and/or theories) of perplexing natural observations. It is also referred to as the scientific process. The method's objective is to provide knowledge that is useful, in the sense that causes are identified to enable accurate forecasts of the future. Since using the HD approach does not guarantee success, the term "method" may be a little misleading. The approach may fail for a number of reasons, not the least of which is that the scientist may not come up with the "right" causal explanation, may not think of efficient ways to test proposed causes, and may not think that the proposed tests are technically viable given the state of technology.

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