How to make a concept map for studying (that actually helps)

A concept map is a diagram of concepts joined by arrows, with the relationship written on each arrow: "higher interest rates make borrowing more expensive", "expensive credit reduces investment". That word on the arrow is the whole method. A concept map for studying is useful when it forces you to say how the ideas in a course connect, not just what they are.

Making one takes four steps: pick a question the map has to answer, list the concepts from the lecture, rank them from general to specific, and join them with arrows that actually say something. Then comes the part almost nobody does and that pays off the most: redrawing it without looking.

I started using them late, in courses where everything depended on everything else and bullet-point summaries stopped being enough. Here's how I build them, using a lecture from an intro macroeconomics course as the example: the one on monetary policy, about thirty slides on what happens when the central bank raises interest rates.

What a concept map is (and how it differs from a mind map)

Joseph Novak came up with concept maps in the early seventies, and his definition is still the clearest: concepts in boxes, connected by lines with linking words that spell out the relationship. Two concepts plus their link make a proposition, a sentence you can read out loud and that is either true or false: "a rate hike attracts foreign capital".

That's the difference from a mind map. A mind map is a tree: a topic in the middle and branches that show what sits under what, without saying why. I covered those in how to make a mind map from a PDF, so this post is about the other kind. In a concept map, the arrow matters more than the box.

That changes what each one is good for:

• A mind map organizes: it shows the structure of a lecture and makes quick review easy.
• A concept map explains: it's worth it when the course is a web of causes and effects, like macroeconomics, sociology or political theory, and the exam asks you to reason through a scenario.

If the exam is mostly isolated definitions, a concept map is a lot of work for little return. If you'll get "what happens to net exports when the Fed raises rates?", it's one of the best things you can do.

How to make a concept map, step by step

With the monetary policy lecture, this is how I build it on paper or in an app:

1. Write a focus question. Novak recommends that every map answer one specific question, because without it everything ends up connected to everything. Mine: "How does an interest rate hike affect the economy?"
2. List the concepts. Go through the slides and write down the concepts that help answer that question: interest rate, borrowing, consumption, investment, saving, aggregate demand, inflation, exchange rate, net exports. Novak suggests 15 to 25 for a full map; for a single lecture, 10 or 12 is plenty.
3. Rank them from general to specific. The broadest idea goes at the top (the interest rate), the most concrete ones at the bottom. It doesn't need to be perfect, it just gives you a place to start.
4. Draw the arrows and write the verb. Interest rate raises the cost of borrowing. Expensive borrowing reduces consumption and investment. Less consumption and investment lower aggregate demand. Lower demand slows inflation.
5. Look for cross-links. These are arrows between different branches, and they're the ones that prove you understood. In my example: higher rates attract foreign capital, which strengthens the dollar, and a stronger dollar reduces net exports, which also lowers aggregate demand. Two separate paths that land in the same place.
6. Read every arrow as a sentence. If it doesn't say anything out loud ("interest rate is related to investment"), that arrow isn't finished.

Step 4 is the hardest and the one that teaches you the most. If you can't name the verb, you don't get that part yet. That gap is exactly what to bring to office hours.

The mistakes that make a concept map useless

Concept maps have a trap: they look good even when they're empty. The mistakes I see most (and have made):

• Arrows with no words. A line between "rates" and "investment" doesn't tell you whether one raises, lowers or defines the other. Without the link it's just a lopsided mind map.
• Filler verbs. "Relates to", "affects", "has to do with". They're honest when you don't know yet, but on a finished map each one is an unanswered question.
• Copying the professor's map. If the slides already include a concept map, looking at it helps; copying it barely does. Deciding the arrows is where the learning happens.
• Cramming the whole course into one map. At forty concepts it stops being readable. Use one map per focus question, and several questions per unit.
• Making it and never looking at it again. A finished map is a review tool, not an assignment you hand in.

What the research says about concept maps

There is evidence. A meta-analysis by Nesbit and Adesope pooled dozens of experiments and found that learning with concept maps was linked to better retention, with effects ranging from small to large depending on how the maps were used and what they were compared against. So they work, but not in just any form.

The catch came from an experiment by Karpicke and Blunt. They compared students who built a concept map with the text in front of them against students who practiced recalling the text without looking, and the retrieval practice group learned more, even on questions that asked them to connect ideas. Building the map with your notes open helps you understand; pulling it out of memory is what makes it stick.

That's why the way I use them combines both. It's active recall in the shape of a diagram.

How to study with the map instead of framing it

Once you have the map for a lecture, this is the loop that works for me:

1. Put it away and wait. A day or two later, not right after.
2. Redraw it from scratch. With only the focus question at the top, draw the map from memory: concepts, arrows and verbs.
3. Compare it with the original. Mark what you missed or got wrong in another color. Those arrows are what you need to study again.
4. Talk it through out loud. Walk the map as if you were explaining it to someone: "if rates go up, borrowing gets more expensive, so...". If you stall on an arrow, there's a gap there. It's the same idea as the Feynman technique, with the map as your script.
5. Turn it into exam questions. Every cross-link is a possible essay question: "Explain why a rate hike can reduce net exports."

With the monetary policy lecture, the first time I redrew it I forgot the whole exchange rate branch. It was exactly the part I hadn't followed in class, and it was on the midterm.

Concept maps from lecture slides

Most of the time your material is the professor's slide deck, and that's where the problem shows up: to connect two concepts with a verb you first have to understand what each slide says, and plenty of them are a title, a chart and three words.

So I understand first and map second. If I don't get a slide, I don't put it on the map with a filler arrow; I flag it and sort it out first. For that part, Filmina, a web app that explains your lecture slides out loud, walks you through the deck slide by slide, charts included, and you can ask it things like "why do higher rates strengthen the currency?" using your own material. You still build the map yourself: choosing the arrows is what does the teaching.

Anything works for drawing it. Pen and paper is the fastest way to redraw from memory. If you want it digital, CmapTools comes from Novak's own group and is free, and any online whiteboard with boxes and arrows will do.

Frequently asked questions

What is a concept map and what is it used for?

It's a diagram of concepts joined by arrows, where each arrow carries a word that says how they relate. It's used to understand subjects where ideas depend on each other and to review by explaining those relationships.

What is the difference between a mind map and a concept map?

A mind map is a tree that shows what sits under what, without explaining the relationship. A concept map joins concepts with arrows and verbs, so every connection reads as a sentence.

How many concepts should a concept map have?

For a single lecture, 10 to 15 concepts is usually enough. For a whole unit, Novak suggests 15 to 25; much more than that and the map stops being readable.

Are concept maps good for studying?

Yes, especially if you redraw them from memory afterwards and compare with the original. Building one with your notes open helps you understand, but recalling it without looking is what makes it stick.