Which framework should I learn first?

STAR if you have a behavioral round coming up — it works across roles (PM, Engineering, Sales, Marketing). CIRCLES if you're prepping product-sense rounds. Together they cover most of the questions you'll face.

Do interviewers care which framework I use?

They care that you're structured, not that you name-drop. Use the framework as scaffolding for your thinking — don't announce it ("I'll use CIRCLES now"). Just clarify, segment, prioritize, and recommend.

Are these frameworks only for product management?

No. STAR is universal (behavioral for any role — SWE, Sales, Marketing, Ops). Root Cause Analysis comes from consulting and applies to any analytical question. CIRCLES, AARRR, and HEART are most common in product / growth interviews, but the logic transfers to adjacent roles.

Can I combine multiple frameworks in one answer?

Yes — and it's often the strongest move. Example: use STAR as the narrative spine of a behavioral case and MECE to organize the Action section. Just don't make the answer feel like a mechanical checklist.

Interview Framework

HEART

Choosing and defending user-centered metrics (Google's own framework)

When to reach for it

'How do you measure…' or 'What are the top 3 metrics for…'

The HEART Cheat Sheet

H
Happiness
Attitudinal — NPS, CSAT, app-store rating.
E
Engagement
Depth of interaction — sessions, time, actions per user.
A
Adoption
New users of a feature in a given period.
R
Retention
Returning users over time.
T
Task success
Can users complete the core job? Completion rate, error rate, time-to-complete.

Step	Meaning	The Move
H	Happiness	Attitudinal — NPS, CSAT, app-store rating.
E	Engagement	Depth of interaction — sessions, time, actions per user.
A	Adoption	New users of a feature in a given period.
R	Retention	Returning users over time.
T	Task success	Can users complete the core job? Completion rate, error rate, time-to-complete.