Exercise 3: Discovering the Wrong Problem After Testing — Possible Solution
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Design thinking's own real, defining property is that it is not a
strict, linear pipeline - Stanford's own materials describe it as
carried out "in a more flexible and non-linear fashion," where teams
can repeat a stage or circle back to an earlier one the moment new
evidence calls for it. Discovering during the Test stage that users
don't actually understand the core problem is exactly this kind of
evidence: it means the team's own original Define stage - their
statement of what the user's real need and problem actually was - was
wrong or incomplete.

The process says the team should go back to the Define stage (and
likely Empathize before it, to gather the real understanding that was
missing) rather than trying to patch the current prototype or pushing
forward to ship it as planned. This is only genuinely possible because
the process is non-linear - a strictly linear, one-pass pipeline would
have no real mechanism for returning to an earlier stage once testing
had already happened; the team would either have to ship a solution
built on a wrong problem statement, or restart the whole process from
scratch rather than revisiting just the one stage that actually needs
correcting.

ANSWER: The team should return to the Define stage (and likely
Empathize) to correct their understanding of the real problem, rather
than continuing to refine the current prototype. This is only possible
because design thinking is explicitly non-linear - a strictly linear
process would have no way to revisit an earlier stage once testing had
already begun.

WHY THIS WORKS AS AN ANSWER
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This correctly applies the chapter's own central finding - that design
thinking's stages can be repeated or revisited out of order - to a
realistic scenario, and explains specifically why a linear process
could not have handled the same situation.