Theory of change vs logic model: what each does and how to keep them consistent

6 min read

Short answer: A theory of change explains why your program should work. It maps the path from activities to long-term change and names the assumptions along the way. A logic model shows what you will do and measure, in one table of inputs, activities, outputs, and outcomes. Both must tell the same story.

Some funders ask for both a theory of change and a logic model, and some proposals submit two documents that quietly disagree. The theory of change promises that families will change how they save. The logic model counts workshops. A reviewer who reads them side by side sees two different programs, and that doubt carries into every section that follows.

This article focuses on the logic model, the table format common with US foundations and many public funders. If your funder asks for a logframe instead, read our companion piece on theory of change vs logframe. It covers that format and how to build program logic from the ground up.

The job of a theory of change

A theory of change sets out how and why a program expects its work to produce change in a specific setting. The Center for Theory of Change describes its job as mapping the "missing middle" that sits between a program's activities and the goals it is reaching for (Center for Theory of Change). It usually starts from the long-term goal and works backward to the conditions that must be in place first.

Most of its worth sits in the assumptions. A good theory of change says out loud what has to be true for each step to lead to the next. Parents will attend if sessions are held after work hours. Trained farmers will adopt the method if seed is available locally. Those sentences are where reviewers test your thinking.

The job of a logic model

A logic model turns the same program into a plan you can manage and measure. The W.K. Kellogg Foundation's widely used guide sets out its parts as resources or inputs, activities, outputs, outcomes, and impact (Kellogg Foundation, 2004). Read from left to right, it says: with these resources, we will do these things, which will produce these products, which will lead to these changes.

A logic model is tidy by design. That is its strength and its risk. The usual table has no natural column for assumptions, even though good guides treat them as part of the model. A table built on its own can look complete while skipping the hardest questions.

The difference in one table

The theory of change is the why. The logic model is the how.

A worked example

The following is an invented example for illustration, not a real client. A youth employment program writes both documents.

Its theory of change says: if young people gain job-ready skills and meet employers directly, more of them will find and keep work. It names two assumptions. Local employers have entry-level vacancies, and young people can afford the travel to placements.

Its first logic model reads:

The two documents do not match. The theory of change depends on meeting employers and on travel costs. The logic model has no employer activity, no travel support, and an outcome too vague to measure.

The revised logic model fixes all three:

Now each assumption in the theory of change has a matching activity or input in the logic model, and the outcome is something the team can count.

How to keep the two consistent

Build the theory of change first. Then check the logic model against it, line by line. We use five questions:

1. Same outcomes. Does every outcome in the logic model appear in the theory of change, in the same words?
2. Assumptions covered. Does each critical assumption have an activity that addresses it, or a risk noted where it cannot?
3. No orphan activities. Does every activity in the logic model lead somewhere in the theory of change? If not, ask why it is in the program.
4. Measurable outcomes. Can each outcome be observed with an indicator, a data source, and a time frame?
5. One vocabulary. Do the proposal narrative, the budget, and the monitoring, evaluation, and learning (MEL) plan use the same terms for the same results?

If the answer to any question is no, fix the theory of change or the logic model before you write the narrative. Fixing it after is much harder.

Mistakes reviewers notice

A theory of change the team cannot walk through. If staff cannot explain each link in plain words, the diagram is decoration.

A logic model added at the last minute. It shows. Outputs drift into the outcomes column, and impact claims grow beyond what the program can reach.

Different words for the same result. "Livelihoods," "income," and "economic resilience" in three documents read as three different goals.

How Edit Right helps

Our Strategic Advisory and Program Design service builds the program logic first. Change Canvas, our theory of change and program design canvas, tests each link for its assumptions and evidence. Our MEL Map model then carries the same outcomes into the measurement plan.

Frequently asked questions

Do we need both a theory of change and a logic model?

Only if the funder asks for both, or your program is complex enough to need the reasoning written out. Even when a funder asks only for a logic model, a rough theory of change drawn beforehand will expose gaps the table hides.

Is a logic model the same as a logframe?

They are related but not the same. A logic model usually lists inputs, activities, outputs, and outcomes. A logframe is a matrix that adds indicators, means of verification, and assumptions for each level. Use whichever format the funder names.

Which should come first?

The theory of change. It sets the goal and the reasoning. The logic model then turns that reasoning into a plan you can deliver and track.

Sources

1. Center for Theory of Change, What is Theory of Change? https://www.theoryofchange.org/what-is-theory-of-change/ (accessed November 13, 2026).
2. W.K. Kellogg Foundation, Logic Model Development Guide, updated January 2004. https://wkkf.issuelab.org/resource/logic-model-development-guide.html (accessed November 13, 2026).

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