The feature we added in project #3 was to enlarge the search bar and make it available even when scrolling. The user doesn't care how the feature works, he or she just wants it to work and be simple, and I believe our feature accomplishes that. The user completely understands a search bar because he or she has seen it a thousand times before.
The mental model is much different from the implementation model because click and type only. No prior knowledge or any kind is needed to operate the site that an implementation model would require.
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