CIRCLES Framework
The CIRCLES Method will ensure that you always give a complete, structured response to any product design or improvement question.
The CIRCLES Method is a 7-step product design framework created by Lewis C. Lin for structuring answers to 'design a product' questions in PM interviews and real discovery work. Each letter maps to a named stage — Comprehend, Identify, Report, Cut, List, Evaluate, Summarize — with defined outputs at every step. It transforms open-ended design prompts into a repeatable process that produces personas, prioritized needs, solution shortlists, and justified recommendations.
“Design a product for senior citizens. It's a classic interview question and I always freeze up and start rambling.”
Answer any product design question with a complete, structured 7-step response
CIRCLES is a 7-step acronym that provides a complete scaffold for any product design or feature improvement question. Step 1 (Comprehend) clarifies the product's goal, constraints, and context before any design begins. Step 2 (Identify) segments potential users and selects a primary target persona. Step 3 (Report) surfaces the selected persona's key pain points and jobs-to-be-done. Step 4 (Cut) applies a prioritization lens — typically impact × frequency or impact vs. effort — to isolate the highest-value user need. Step 5 (List) brainstorms 2–4 concrete product or feature solutions. Step 6 (Evaluate) compares those solutions on dimensions of user impact, technical feasibility, and business risk. Step 7 (Summarize) delivers a structured final recommendation with clear rationale. The entire sequence was designed to be repeatable across any product domain — consumer apps, enterprise tools, hardware, or platform features.
Most PM candidates and early-career product managers have a fatal flaw on design questions: they jump straight to feature ideas without establishing who the user is, what they actually need, or why one solution beats another. The result is an unfocused answer that covers many users poorly, proposes features without prioritization logic, and ends with a vague 'it depends' rather than a clear recommendation. Interviewers — and real stakeholders — lose confidence fast.
Walk through any product design question — interview prep or real work — using the same 7-step CIRCLES sequence every time: you'll never skip the user, never forget to prioritize, and never end without a justified recommendation.
- A product design prompt or feature question (interview question or real work scenario)
- Any known constraints: platform, audience, business goals, or timeline
- Your current thinking — even partial ideas or user segments you're already considering
- The step you're stuck on, if you want to focus on a specific part of the framework
- A completed CIRCLES Answer Blueprint — structured outputs for all 7 steps
- A selected user persona with demographics, behaviors, and top pain points
- A scored Needs Prioritization Matrix ranking user problems by impact × frequency
- A Solution Comparison Table evaluating 2–4 options on feasibility, user impact, and business risk
- A polished final recommendation paragraph ready for an interview or stakeholder presentation
Watch the methodology work.
Three specimens from a single real session: the same situation, unaided and calibrated, the full transcript, and the skill answering live in the channel where the work happens.
“You're in a PM interview. The question: 'Design a product for senior citizens.' You start talking about three different user types at once, jump to feature ideas like 'medication reminders and fall detection,' and end with 'it depends on the specific use case.' You never committed to a user, never justified your feature choices, and gave no recommendation. The interviewer says 'interesting' and marks a low score for structure.”
“Using CIRCLES, you walk through every step in sequence: you clarify scope (mobile app, quality of life), select homebound seniors 70–85 as your persona with stated rationale, surface social isolation as the top need using impact × frequency scoring, propose three distinct solutions, evaluate each on feasibility and adoption risk, and close with a clear recommendation — the Simplified Video-Call App with family-managed onboarding — and a one-sentence rationale. The interviewer asks a follow-up question. You have a framework for that too.”
The same skill, where the work happens.
No new app to learn. The methodology runs over the WhatsApp Business API, so the answer lands as a reply in the thread you’re already in — same rigour, zero context-switch.
What it does, specifically.
Each capability is a distinct move drawn straight from the source methodology — not a generic assistant guessing.
Situation Comprehension
Before designing anything, CIRCLES demands that you understand what problem you're actually solving. This capability guides you through clarifying the product's goals, constraints, success metrics, and any ambiguities in the prompt — ensuring the rest of your answer is scoped correctly.
Customer Segmentation & Persona Selection
You can't design for everyone. This capability walks you through generating a clear user segmentation (e.g., by age, tech comfort, use case, or role) and committing to one primary persona with a stated rationale — the foundation for every subsequent step.
Needs Prioritization Matrix
Not every pain point deserves a product solution. This capability applies a scoring heuristic — impact × frequency by default, or impact vs. effort for feature tradeoffs — to your list of user needs, helping you cut to the one or two highest-value problems worth solving.
Solution Brainstorm
With the highest-priority need locked in, this capability generates 2–4 concrete product or feature solutions — distinct enough to represent real options, specific enough to evaluate. Each solution gets a one-sentence description of how it addresses the target need.
Tradeoff Evaluation & Recommendation Synthesis
The final two CIRCLES steps run together in conversation: first, comparing your solutions on feasibility, user impact, and business risk in a structured table; then synthesizing that analysis into a clear, confident recommendation with rationale. You walk away with a complete answer that any interviewer or stakeholder can follow.
Graded before it shipped.
Every skill is scored against independent scenarios for methodology fidelity before it goes live — not vibes, a rubric.
CIRCLES Answer Blueprint
A structured 7-section document capturing the output of each CIRCLES step for a specific design prompt — from clarified scope and selected persona through prioritized need, solution shortlist, tradeoff analysis, and final recommendation. Suitable for interview prep review or stakeholder sharing.
User Persona Card
A focused one-page persona summary for the selected target segment, including demographics, behavioral context, top pain points, and jobs-to-be-done — derived from the Identify and Report steps.
Needs Prioritization Matrix
A scored table ranking 3–5 user needs by impact × frequency (or an alternate scoring dimension), with the selected 'cut' need highlighted and the rationale for deprioritizing others documented.
Solution Comparison Table
A side-by-side comparison of 2–4 candidate solutions evaluated across user impact, technical feasibility, and business risk — the direct input to the final recommendation.
Grounded in the original work.
Every answer traces back to a real source and the practitioner who wrote it — not a secondhand summary. Here is the source of record.
Lewis C. Lin
Lewis C. Lin is the creator of the CIRCLES Method and author of 'Decode and Conquer: Answers to Product Management Interviews,' the most widely used PM interview prep book in the industry. A Harvard MBA and former PM at Google and Microsoft, he has coached thousands of PM candidates through his books, online courses on Udemy and Coursera, and his PM interview coaching programs.
Decode and Conquer: Answers to Product Management Interviews
Harvard MBA; former PM at Google and Microsoft; author of Decode and Conquer; PM interview instructor on Udemy and Coursera.
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