Product design question

Design a pen for an astronaut.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

First-principles product design under extreme, unusual constraints, testing whether you identify the real requirement rather than a generic pen.

Clarify the actual constraint: standard ink pens rely on gravity and cannot write in zero gravity or extreme temperature variation.
Users: astronauts needing to write notes or logs reliably during spaceflight and extravehicular activity.
Core requirement: the pen must write in zero gravity, extreme heat and cold, and possibly underwater or on greasy surfaces.
Solution: a pressurized ink cartridge system that pushes ink to the tip rather than relying on gravity, avoiding the need for a design switch to pencils due to graphite dust risk in a spacecraft.
Weigh alternatives: mention why pencils were historically considered but rejected due to flammable and conductive graphite dust risk in a sealed cabin.
Success metric: reliability rate of legible writing across the required condition range, tested before flight certification.

Identifies the real constraint precisely, gravity dependence of standard pens, rather than treating this as a generic pen redesign.
References the graphite dust safety risk with pencils, a well known reason (common knowledge) engineers moved to a pressurized pen design.
Proposes the actual working mechanism, pressurized ink delivery, grounded in how such pens are known to function.

Designing a generic ergonomic pen with no consideration of the zero gravity and temperature constraints.
Not addressing why a simple pencil is not a safe substitute in a spacecraft.
No mention of the pressurized ink mechanism or an equivalent solution to the gravity problem.

Chapters of the AI PM course that teach what this question tests.