Someone who has an idea that something might work based on theory or watching it in action and testing the idea is thought of as:

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The term "naïve scientist" refers to individuals who form hypotheses and test them based on observations and theoretical knowledge, similar to how a scientist operates but without formal training or systematic methodology. This concept is often used in psychology to describe how people make sense of the world and others' behavior through informal methods.

Someone Who Has an Idea That Something Might Work Based