Exercise 2: Why One Expert's Heuristic Evaluation Can't Replace Real User Testing — Possible Solution
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This reasoning fails on two separate real points from this chapter.
First, Nielsen's own recommendation for heuristic evaluation itself is
3-5 independent evaluators, not one - a single reviewer, no matter how
experienced, reliably misses a real share of the issues another
evaluator would catch. One senior designer's own review, however
skilled, is already short of what heuristic evaluation itself
recommends.

Second, and more fundamentally, heuristic evaluation and real user
testing measure genuinely different things, and one cannot substitute
for the other. A heuristic evaluation is expert judgment against a
fixed checklist - it's fast and catches well-known usability patterns
early, but it structurally cannot surface real user context,
motivation, or the genuinely novel problems real people encounter that
no heuristic anticipated in advance. Only real usability testing with
actual users attempting actual tasks can reveal that kind of problem -
which is exactly why the chapter states heuristic evaluation cannot
replace real user research.

ANSWER: This reasoning doesn't hold up for two reasons - one expert
alone falls short of even the 3-5 evaluators heuristic evaluation
itself recommends, and more importantly, heuristic evaluation and real
user testing measure fundamentally different things. Expert review
against a checklist cannot surface the real user context, motivation,
or genuinely novel problems that only actual usability testing with
real users can reveal.

WHY THIS WORKS AS AN ANSWER
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This correctly identifies both real gaps in the manager's reasoning -
an inadequate evaluator count and the deeper structural limitation of
heuristic evaluation as a method - rather than addressing only the
surface-level "one expert isn't enough evaluators" point.