1) answer to a problem a) solution b) prototype c) problem 2) an experimental (or original) model to illustrate (show) a designed product a) modify b) solution c) prototype 3) any question or matter involving doubt, uncertainty, or difficulty a) modify b) problem c) challenges 4) to do something creative or constructive a) prototype b) modify c) create 5) difficulties in a problem or task (that is stimulating to one engaged in it); a stimulating task or problem a) modify b) solution c) challenges 6) change somewhat from the form or qualities of; to make changes in; to alter a) modify b) challenges c) create

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