Formative Evaluation
Research conducted during development to find problems and improve a design-in-progress. The goal is to shape and refine, not to measure final quality.
Definition: Research conducted during development to find problems and improve a design-in-progress. The goal is to shape and refine, not to measure final quality.
Formative evaluation is research conducted during the design and development process with the explicit goal of identifying problems and improving the product before completion.
When It Happens
Formative evaluation occurs during prototyping—as ideas turn into tangible low-, medium-, and high-fidelity prototypes. This is the prime time for iterative testing, triggered at every major iteration or whenever important questions accumulate.
Purpose
The goal is diagnostic: find issues while they are still cheap to fix.
| Aspect | Formative Evaluation |
|---|---|
| Timing | During development |
| Goal | Find problems, improve design |
| Question | "What's not working?" |
| Sample size | Smaller, iterative |
| Outcome | Design changes |
Why It Matters
Problems found during formative evaluation cost a fraction of what they would cost to fix after launch. A UX test on a clickable prototype might identify a fundamental navigation issue that takes days to fix—the same issue found after development might require weeks of engineering rework.
Contrast with Summative Evaluation
Where formative evaluation asks "What should we change?", summative evaluation asks "How well does the finished product perform?" Both are essential, but they serve different purposes at different stages.
Related Terms
Summative Evaluation
Research conducted at the end of a development cycle to measure the finished product's success against defined criteria. The goal is assessment, not iteration.
Evaluative Research
Research that assesses whether a specific solution works, either during development (formative) or after completion (summative). Answers 'Does this work?' rather than 'What should we build?'
UX Test
A Core Method combining all three Building Blocks: testing task completion (effectiveness and efficiency), observing behavior and non-verbal cues, and asking questions about the experience. The most comprehensive single research method.
Mentions in the Knowledge Hub
This term is referenced in the following articles:
Research Timing and Team Foundation: When to Research and Who Does It
One of the most common points of friction is not about budget or methods, it is about timing. Your core job is to reframe research from a single, disruptive event into a continuous, value-adding loop.
When to Research: A Guide for Product Teams
Don't wait for the beta. The 3 critical moments to test: Concept (Generative), Prototype (Formative), and Live (Summative).