Final answer:
In the concept testing stage of new-product development, a product concept in physical or symbolic form is presented to groups of target consumers through the use of a prototype.
Step-by-step explanation:
In the concept testing stage of new-product development, a product concept in physical or symbolic form is presented to groups of target consumers. This is typically done through the use of a prototype. A prototype is a trial working model of a design that is built to test design decisions and identify potential problems. The purpose of presenting the prototype to the target consumers is to gather feedback and evaluate the product concept.