Design thinking is a process where you think of a problem and a way to solve the problem. Then, you make a prototype to try to solve the problem. Lastly, you think of revisions for the prototype.
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First you need to Empathize, how would someone else approach the problem. Then you you Define, what is the problem you are trying to solve. Next you Ideate, what can you do to solve the problem. Then you make a Prototype, make something to solve the problem. Last you test your prototype. Did it work? If it did you were successful, and now you repeat the process with a different problem.