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A UX teardown of Walmart's signed-out deals flow: a savings hub and an under-$50 tech filter that lead to a $39.99 game with no reference price, a third-party seller named at the bottom of the buy box, and review filters that take 150 ratings down to three verified four-star reviews.

The gestalt principles describe how people group what they see: proximity, similarity, common region, closure, continuity, figure-ground, common fate. On a real screen several apply at once, and the layout bugs come from two of them giving different answers.

Retention and coercion move the same number. A test that tells them apart, the mechanisms that pass it, the ones that fail, and how to measure retention so the difference shows up before your support queue finds it.

What a control group is, how it differs from the experimental group and from a control variable, and how to set one up for a UX experiment or A/B test without quietly breaking it.

Fidelity isn't a quality ladder you climb. What a wireframe is supposed to settle, what lo-fi, mid-fi, and hi-fi each buy you, when a mood board is the right artifact instead, and the failure mode that costs teams a sprint.