Product design question
Design a grocery store checkout.
- Product design
- Easy
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What this question tests
Foundational product design skill, structuring a familiar physical experience around user needs and constraints.
How to approach it
- Clarify scope: designing the physical checkout layout, the self-checkout software, or the end to end payment experience.
- Identify user segments, quick trip shoppers, full cart families, and elderly or disabled customers who need different support.
- Map pain points, long lines, scanning errors at self-checkout, and age verification for restricted items.
- Prioritize the biggest pain point, likely line wait time and self-checkout error rate.
- Propose solutions, e.g. weight-verified self-checkout stations plus a dedicated fast lane for small baskets.
- Define success metrics, average wait time and self-checkout error or theft rate.
What a strong answer includes
- Separates self-checkout design from staffed checkout design, since they have different failure modes.
- Names a concrete friction point, e.g. weight mismatch false alarms, and proposes a fix like better calibration or a manual override.
- Considers accessibility, such as an assisted lane for elderly or disabled shoppers.
- Picks a measurable target, e.g. cutting average wait time by 20 percent, marked as an assumption.
Common mistakes
- Treating this as purely a UI exercise and ignoring physical store layout.
- Not addressing theft or error rates at self-checkout.
- Skipping accessibility considerations.
Likely follow-up questions
- How would you reduce self-checkout theft without adding friction.
- How would you measure the success of a new checkout design.
- How would this differ for a small urban store versus a large suburban one.
More product design questions
- Design a TV for a car.Google · Product design · Hard
- Design a refrigerator for the blind.Google · Product design · Hard
- How do you design a camera for the elderly?Google · Product design · Medium
- Redesign Twitter for eCommerce.Shopify · Product design · Hard
- How would you go about designing a new location sharing app for Google?Google · Product design · Medium
- How would you improve Google Home?Google · Product design · Easy
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 4: Discovery and strategy for AI products
- Chapter 7: AI UX and human oversight: design for a system that is wrong sometimes
- Chapter 14: Get the job: the AI PM interview loop