What a concept map is
A concept map is a diagram of ideas in which every connection carries a label. Concepts sit in boxes or circles, and lines between them are marked with short linking phrases such as “causes,” “is part of,” “depends on” or “is an example of.” Read along any line and you get a small statement: “Evaporation leads to condensation.” These statements are called propositions, and a map is essentially a set of them arranged so you can see how they fit.
The technique is generally associated with the educator Joseph Novak and colleagues, who developed it in the 1970s in the context of research on how learners’ understanding changes. Research on concept mapping in education suggests it can be a useful way to organize and check understanding, but results vary with how the maps are used, and it is not a guaranteed route to better results.
What lists hide
Lists are good at showing items and order. They are poor at showing how items relate. A list of terms from a biology unit, such as producer, consumer, decomposer, energy and nutrients, tells you what to know but not how the terms depend on one another. Creating a concept map forces you to decide: do decomposers return nutrients to producers? Does energy flow in the same way as nutrients? If you cannot label a link, you have found a gap in your understanding, which is a useful discovery before an exam rather than during it.
Another difference is that lists tend to be hierarchical in a single direction, while real topics have cross-links. A concept map can show that one idea connects to several others, including across branches.
How to build one
- Start with a focus question. For example, “How does water move through the environment?” A question keeps the map from sprawling, and it gives a clear test of when you are done.
- List the key concepts. Write 10 to 20 terms on sticky notes or a scrap sheet. Use nouns or short noun phrases. Do not worry about order yet.
- Rank them roughly. Put the broadest, most general concept near the top (or center) and more specific ones below or around.
- Place and connect. Arrange concepts and draw lines between related ones.
- Label every line. Add a verb or short phrase so each connection reads as a sentence. This step is the heart of the technique.
- Look for cross-links. Connect ideas in different parts of the map and label those as well. Cross-links often show the most interesting relationships.
- Revise. Maps rarely look right on the first try. Move things, rewrite labels and add or delete concepts.
- Check it. Read each line aloud as a sentence. If it is wrong or vague, fix it.
A small hypothetical example
Focus question: “Why do plants need sunlight?”
Concepts: sunlight, chlorophyll, leaves, water, carbon dioxide, glucose, oxygen, photosynthesis.
Some propositions you might write:
- Leaves contain chlorophyll.
- Chlorophyll absorbs sunlight.
- Photosynthesis uses sunlight, water and carbon dioxide.
- Photosynthesis produces glucose and oxygen.
On the map, “photosynthesis” would sit near the center, with arrows from sunlight, water and carbon dioxide pointing in, labeled “uses,” and arrows pointing out to glucose and oxygen, labeled “produces.” A cross-link might connect “glucose” to “plant growth” with “provides energy for.” Reading the map, you see not only the terms but the process.
Concept maps compared with mind maps
The two are often confused. A mind map radiates from one central idea with branches, usually using single words, colors and pictures, and links are mostly implied by the branching. It is quick and good for brainstorming, as the article on mind mapping explains. A concept map is more formal: it can have multiple top-level ideas, cross-links and, most importantly, labeled connections. That makes it slower to produce but better for showing exactly how ideas relate. Neither is better in general; they suit different jobs.
Where concept maps help
- Planning a topic or essay before writing. The map can reveal an order of argument that supports a thesis statement and an essay structure.
- Revising: redrawing a map from memory is a form of retrieval practice, and comparing it to your notes shows what you missed.
- Combining readings: building a map across several texts shows where they overlap or conflict.
- Seeing the big picture in subjects with many linked parts, such as science, law-style reasoning or history with cause and effect.
The practice of combining words with visual layout is connected to what researchers call dual coding, although the evidence on its benefits varies by task.
Limits
- Maps take time. They are less useful for quick lecture capture than for review.
- Big maps become tangled. If a map exceeds a page, consider splitting it into sub-maps linked by a shared concept.
- They suit relational knowledge better than step-by-step procedures, where a flow chart or numbered list may be clearer.
- A neat-looking map is not proof of understanding. You can draw confident lines that are wrong, so check against reliable sources.
Linking maps to your notes
A map works well as a companion to notes, not a replacement. After taking notes using one of the methods in the note-taking methods comparison, build a map at the end of a unit to see how the pieces connect. The same instinct underlies linked notes, where connections are written between separate short notes instead of drawn on a single page. Keep the focus question at the top of the map so that you remember what it was for, and date it so you can see how your understanding changes when you redraw it later.