What is often used to test the idea before it runs to try to determine whether it works?

Question

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Concept testing is a process used to evaluate the viability of a new product or service idea before it is launched in the market. It is a preliminary research stage where a concept is presented to a target audience to obtain feedback on whether they will be interested in and willing to purchase the product. By doing concept testing, companies can reduce the risk of a new product or service failing in the market.

What Is Often Used to Test the Idea Before It