What's the difference between formative and summative evaluation, and why does my funder want both?

Direct Answer

The difference between formative and summative evaluation is what the information is for: formative evaluation is learning and improving while the work is underway, and summative evaluation is demonstrating results and explaining impact. Funders ask for both because each does what the other can't. Formative findings help the project improve as it runs, and summative findings show what it accomplished. One evaluation plan can include both, with formative work throughout the funding period and summative work mostly at the end of a year or of the grant.

Lauren McClain, Ph.D.

Lauren McClain, Ph.D.

Co-founder and workforce development consultant, Grantibly

Best Move

Check that your evaluation plan says when formative findings will reach the project team during the year, as well as what the summative evaluation will report at the end.

Why It Works

Formative evaluation only helps if findings arrive while there's still time to make changes, and summative evaluation is easier to interpret when you know how the program was carried out.

Next Step

Look at your evaluation timeline and mark each point in the year when the project team will hear findings and talk about what to change.

What you need to know

Annual reports and final reports matter, but project teams should not have to wait until the end of a grant to learn something important.

Lauren McClain, Ph.D., Grantibly

What does formative evaluation look like during a grant's funding period?

During a grant's funding period, formative evaluation looks like gathering information while the program runs and sharing actionable findings while there's still time to make changes to improve the program. The information can come from participation records, surveys, interviews, focus groups, or meetings with the team or other stakeholders.

Much of it is about how the program is being carried out. Was it implemented as intended? Who is taking part, and who isn't? How much of the program are students or participants receiving? What barriers have come up, and are some parts working better than others? For example, attendance records might show that fewer participants come to one part of the program, and a few interviews might help explain why.

At Grantibly, formative findings reach the project team through regular meetings and shorter summaries between formal reports, so the team isn't waiting for the annual report to hear them.

When does summative evaluation happen?

Summative evaluation happens mostly at the end of a year or funding period, and it focuses more on outcomes or impact than on implementation and process. It asks what the project accomplished, what changed for the students or participants it served, and what the team learned.

NSF's Advanced Technological Education program is one example of how a funder describes this. Its solicitation says the evaluator's primary role is to inform the project team's decisions about changes to the project as it's carried out, which it calls formative evaluation, and that at the end of the project the evaluator should provide a summative evaluation identifying key accomplishments, their impacts, and lessons learned. Your own funder may describe it differently, so check your solicitation.

Summative results are hard to interpret without the formative record. If outcomes fall short, that doesn't automatically mean the idea behind the program was ineffective. It may not have been fully implemented, or participants may not have received enough of it. Positive outcomes don't automatically show what produced them, either. What the evaluation contributes to each year's report is covered in What does my funder's annual report actually need from the evaluation?

How does the project team use formative findings?

The project team uses formative findings to adjust the program while it's running: what to keep or enhance, what to change, and what to remove so the program can do the most good. That works best when findings become part of project meetings and planning conversations, where the team can talk through what a finding means, why it might be happening, and what to try next.

When the team does change something, the evaluation records what changed and why, so the summative evaluation can account for it later. Our program changed mid-grant. Can we change the evaluation plan too? covers how that works with your funder. If a formative finding suggests part of the program isn't working, that's a separate question, and What if the evaluation shows my program isn't working? takes it up.

The Grantibly perspective

Lauren's perspective

We don't think evaluation should operate on a separate track from the program. The cycle we look for runs from the program to the data, from the data to learning, from learning to action, and from action back to a better program, and it should happen throughout the life of a project. That's why we share useful findings while there's still time to act on them.

It's also why we pay attention to how a program operates, and not only to its outcomes. Projects are often eager to know whether their program "worked." That's an important question, but it's difficult to interpret outcomes without understanding implementation. Understanding how a program operates is part of understanding its results.

More questions about this topic

What if my funder only asks for a final evaluation report?

If your funder only asks for a final evaluation report, the summative evaluation is the requirement, but formative evaluation is still worth planning. A final report tells you what happened after it's too late to change anything, while findings shared during the grant give the team a chance to improve the program while it's running.

Will reviewers notice if our evaluation plan is only summative?

Reviewers can notice an evaluation plan that is only summative. Reviewers like to see the evaluation being used to enhance the program as it is implemented, so a plan that only evaluates the program at the end can be flagged. If that happened to your proposal, My proposal was declined and reviewers flagged the evaluation plan. How do I fix it? covers how to rebuild it.

Does the same evaluator do both formative and summative evaluation?

The same evaluator usually does both formative and summative evaluation within one evaluation plan. NSF's ATE solicitation, for example, describes the project evaluator doing both: informing the team's decisions during the project and providing the summative evaluation at the end.

Is formative evaluation a judgment of how we're doing?

Formative evaluation does look at how you're doing, but as a source of information to learn from rather than a judgment. Sometimes the data shows strong results, sometimes mixed ones, and often both strengths and opportunities to improve. Finding something early enough to improve it can be one of the most valuable outcomes of an evaluation.

Related pages

Lauren McClain, Ph.D.

Lauren McClain, Ph.D.

Lauren McClain, Ph.D. is a co-founder of Grantibly and a workforce development consultant who develops the workforce through evaluation, training, facilitation, and strategic planning. A sociologist and former faculty member at Savannah State University and Western Kentucky University, she taught more than 50 social research methods courses, mentored more than 21 thesis and dissertation committees, and served on three Institutional Review Boards. Her work helps organizations use evidence to understand what is happening, decide what to do next, and do MORE good.

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