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.
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.
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 |
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.
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.
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.
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?'
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.
This term is referenced in the following articles:
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.
Don't wait for the beta. The 3 critical moments to test: Concept (Generative), Prototype (Formative), and Live (Summative).