Exercise 3: Shipping a Redesign Without Retesting — Possible Solution
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This skips the real fourth step of the iterative design loop -
Retest. The team completed Test (the original round that surfaced the
problem), Learn (identifying what was wrong), and Redesign (changing
the checkout flow to address it), but shipped immediately afterward
without confirming, through a real retest, that the redesign actually
fixed the original problem - or that it didn't introduce a brand new
one in the process.

The real risk this creates is shipping a change based only on an
assumption that the redesign worked, rather than real evidence that it
did. A redesign can easily fail to fully fix the original issue, or
fix that issue while accidentally creating a different, new problem
elsewhere in the flow - and without a retest, the team has no real way
of knowing which of these actually happened until it's already live
for every real user, rather than caught safely beforehand the way a
retest is meant to catch it.

ANSWER: This skips Retest, the final step of the loop. The real risk is
that the team ships a redesign based only on the assumption it fixed
the original problem, with no real confirmation - it could still fail
to fix the issue, or introduce a new one, and without a retest neither
possibility would be caught before real users encounter it live.

WHY THIS WORKS AS AN ANSWER
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This correctly identifies Retest as the specific skipped step and
explains the concrete risk of skipping it - shipping on assumption
rather than confirmed evidence - rather than describing the loop only
in the abstract.