Behavior-Change Design for a Smoking-Cessation Companion App
Overview
What this challenge is about.
Audit the current daily loop and map every screen to BCTs from Michie's v1 taxonomy (93 techniques). Identify gaps (likely: weak self-monitoring, missing implementation intentions, no social-comparison signal). Redesign the loop with 4-6 BCTs explicitly layered in: streak surfaces, IF-THEN plans, social-comparison cards, and reward reframing. Build a 4-week iOS prototype using TestFlight. Run a within-subject pilot with 15 users (4 weeks current loop, 4 weeks redesigned). Measure: daily-engagement minutes, craving-event logs, self-reported quit attempts. Deliver: BCT-mapping spreadsheet, redesigned interaction spec, prototype build, 8-page research write-up.
The Brief
What you'll do, and what you'll demonstrate.
Lift 30-day quit rate from 18 percent to 25 percent via a behavior-change-grounded redesign of the daily-engagement loop.
Earning criteria — what you'll demonstrate
- Apply Michie's behavior-change taxonomy to a real consumer-health interface
- Design within-subject pilot studies that yield publishable evidence
- Specify interaction patterns grounded in behavior-change theory
- Communicate HCI research at conference-paper level
Program Fit
Where this fits in your program.
Sharpens the same skills your degree expects you to demonstrate.
Skills
Skills you'll demonstrate.
Each one shows up on your verified credential.
Careers
Roles this prepares you for.
Real titles. Real skill bridges. Pick the one closest to your trajectory.
Product Manager
Product managers who can ground design in behavior-change theory and validate with a within-subject pilot are who digital-health and regulated-product companies put on lead roles.
This challenge sharpens
- behavior-change-design
- user-centered-design
- hci-research-methods