Product design question
Design a Fitbit app for kids.
- Product design
- Medium
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What this question tests
Product design for a young user segment with parental oversight needs, balancing motivation with privacy and healthy screen habits.
How to approach it
- Segment users: kids as the primary device wearer, and parents as the account owner and oversight stakeholder.
- Identify the pain point: kids need fun, non-intimidating motivation to stay active, while parents need visibility without feeling like surveillance.
- Prioritize the motivation design for kids first, since low engagement is the biggest failure mode for a kids fitness product.
- Design the solution: playful goal framing, adventures, badges, friendly competition with siblings, rather than adult-style step counts.
- Add a parental layer: a simplified parent dashboard with positive framing rather than strict monitoring.
- Define success: weekly active-movement days per child and parent-reported satisfaction, not just raw step count.
What a strong answer includes
- Distinguishes the child's motivational needs from the parent's oversight needs as two separate design problems.
- Proposes playful, age-appropriate framing instead of copying adult fitness tracker mechanics.
- Balances parental visibility with avoiding a surveillance feel, an important trust consideration for this age group.
- Uses active-movement days, a behavior-based metric, rather than raw step count which can be gamed.
Common mistakes
- Copying adult UI and metrics directly without adapting to a child's motivation style.
- Designing purely for parental monitoring, ignoring the child's actual engagement.
- Ignoring data privacy considerations for a minor user base.
Likely follow-up questions
- How would you handle data privacy and consent regulations for children's data?
- How would you prevent kids from gaming the step count, like shaking the device?
- How would you design this differently for younger kids versus preteens?
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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