Exercise 1: Button Color/Size vs. a Genuine UX Change — Possible Solution
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Making a button bigger and changing its color are both changes to the
checkout button's own visual and interactive surface - exactly what UI
covers. Neither change touches whether the checkout flow itself
actually solves the user's real problem: finding out whether it's
easy to complete a purchase, whether the steps make sense, whether
information the user needs (shipping cost, delivery date, total price)
is available when they need it, or whether the flow causes real
confusion or abandonment.

A genuine UX change to checkout would start with real user research -
watching people actually attempt to check out, finding out where they
hesitate or give up, and understanding why - then redesigning the
underlying flow itself based on that evidence: maybe removing an
unnecessary form field, showing the total cost earlier, or letting
guest users skip account creation. The button's own color and size
might change too as part of that larger effort, but the UX work is the
research and flow redesign behind it, not the button's own appearance.

ANSWER: This is a UI change, not a UX change, because it only alters
the button's own visual appearance rather than the underlying checkout
flow or the real problem it's meant to solve. A genuine UX change would
involve researching how users actually experience checkout and
redesigning the flow itself based on what that research finds.

WHY THIS WORKS AS AN ANSWER
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This correctly applies the chapter's own UX-vs-UI distinction - UI is
the visual/interactive surface, UX is the whole experience and outcome
- to a concrete, everyday example rather than restating the definition
in the abstract.