How to Quantify User Experience: HEART, GSM, and the 5‑Degree Model Explained
This article explains why measuring user experience is essential and introduces three major UX measurement frameworks—the Google HEART model, the GSM model, and the 5‑Degree model—plus Alibaba Cloud's UES system, detailing their components, metrics, and practical application for product design.
User Experience
UX was first introduced by Donald Norman, defined as all interactions between a user and a product, service, or business.
According to Wikipedia, UX encompasses behavior, emotions, and attitudes, including interaction, operation, experience, emotion, meaning, and value, reflecting a user's subjective perception of a system's functionality, usability, and efficiency.
Why Measure UX?
Because UX is subjective, measurement provides rational, quantifiable indicators that help evaluate and improve designs for both business and users.
UX Measurement Models
1. Google HEART + GSM Model
HEART Framework
Happiness : measures user attitude via surveys (e.g., satisfaction, ease of use, Net Promoter Score).
Engagement : measures interaction frequency, intensity, or depth (e.g., weekly visits, daily uploads).
Adoption : measures new users of a product or feature (e.g., accounts created in the last week).
Retention : measures repeat usage (e.g., proportion of active users who remain after a period).
Task Success : measures efficiency, effectiveness, and error rate (e.g., task completion time, success rate, error rate).
Not all categories are needed for every product; for B2B tools, engagement may be less relevant than satisfaction and task success.
GSM Model
Goal : define high‑level objectives to select appropriate metrics.
Signal : map goals to observable user behaviors or attitudes sensitive to design changes.
Metric : refine signals into measurable indicators for tracking over time or A/B testing.
2. 1688 “5‑Degree” Model
Attractiveness : ability to draw users before interaction (awareness, reach, click‑through, exit rates).
Completion : ability to finish tasks efficiently (first‑click time, completion time, success/failure rates).
Satisfaction : subjective post‑task feelings (ease of use, layout, visual appeal, readability).
Loyalty : likelihood of repeat use (7‑day/30‑day return rates, cross‑platform usage).
Recommendation : willingness to recommend (Net Promoter Score).
The “5‑Degree” model can be combined with the GSM model to create a quantitative matrix.
3. Alibaba Cloud UES
UES is Alibaba Cloud Design Center’s experience measurement system, covering models, management mechanisms, usability testing, and digital tools.
Usability : core dimension reflecting learnability, operability, and clarity, improving efficiency, task completion, and satisfaction.
Consistency : uniformity across products (style, framework, components) that reduces learning cost, errors, and boosts developer efficiency.
Satisfaction : degree to which expectations are met, influencing repeat use and recommendation.
Task Efficiency : task completion rate and time, especially for complex cloud workflows.
Performance : metrics such as First Meaningful Paint, page response time, and API latency.
Zhaori User Experience
Zhaori Technology is a user-centered team of ambitious young people committed to implementing user experience throughout. We focus on continuous practice and innovation in product design, interaction design, experience design, and UI design. We hope to learn through sharing, grow through learning, and build a more professional UCD team.
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