Where we start
Same meeting, third time. Daybreak is launching its autumn roast, fourteen things were said, and by the end of session 2 they sat under five branches with a keyword each. One of them would not sit still. "Legal sign-off" belongs to the sleeve copy, which is Packaging, and to the landing page, which is Comms. It got drawn under both. Tonight is about that stowaway, and what it is telling you.
★ What you walk out with tonight. The name of the diagram your notes actually are, out of three candidates: mind map, concept map or list. And the one-home-plus-pointer fix applied to your own map, so the stowaway lives once and every node has exactly one parent again.
Neighbours, so you land in the right place. Argument mapping and decision matrices are diagrams with their own rules; they are named tonight so you can recognise them, not taught. Novak's concept-mapping software, CmapTools from IHMC, is named for the same reason and not toured. The subject is the three shapes and the one question that tells them apart.
An idea that wants two parents
6 min liveA mind map is a tree. That is not a style choice; it is what makes the map readable at a glance, because every idea has one place and you find it by walking one branch. The moment one idea needs two branches, the tree is broken, and the break is worth more than the map, because it tells you what the material really is.
LiveThe cross-link test4 min▶
When an idea belongs in two branches, exactly one of three things is true. Work out which, and you know what to draw.
- The branches were cut wrong. "Legal sign-off" sits under Packaging and Comms because the map split the launch by department, and legal review is a stage, not a department. Regroup the branches so the idea has one natural home, and it stops needing two. Most cross-links die here. It is still a mind map.
- The material has real many-to-many relations. Legal genuinely gates both the sleeve and the page, and the page genuinely depends on the sleeve's origin claim. Regrouping will not make that go away, because the relations are the content. You are drawing a concept map, and it needs boxes and labelled lines, which is part 2.
- The material is a sequence. Draft, legal review, print, ship. The idea "belongs in two places" because it comes after one thing and before another, and a tree has no "after". The map was never the right shape. It is a list, which is part 3.
The test is cheap: one duplicated label. What it buys is the right diagram, and the right diagram is the difference between a page you can read at a glance and a page that looks like a map and reads like a puzzle.
Self-studyWhy a strict mind map has no cross-links4 min▶
A strict mind map has one root, its edges mean "relates to", and every node has exactly one parent. There are no cross-links. Buzan's tenth law allows arrows for emphasis, and it is tempting to read those as permission to connect branches, but an emphasis arrow is annotation drawn on top of the tree; it does not change which branch an idea lives on, and it is not how the page is read. Structure is the tree. Everything else is ink.
The reason the strictness is worth keeping is the reason a map works at all. You find an idea by picking a branch and walking outward, and that only works if the idea is on one branch. Two homes means two places to look and no rule for which; the reader has to search, and a page you search is a list with worse typography.
| Diagram | Roots | Edges | Parents per node | Reading order | Best for |
|---|---|---|---|---|---|
| Mind map | One | Unlabelled: "relates to" | Exactly one | Centre outward, any branch first | Grouping what you know about one thing |
| Concept map | One or a few, top-down | Labelled with linking words | Any number; cross-links allowed | Top to bottom, along the propositions | Showing how ideas depend on each other |
| List | None | None; position is the edge | One, implicitly the item above | First to last | Steps, rankings, checklists: anything whose order carries meaning |
Read the "parents per node" column and the cross-link test is the whole table in one line. One parent, mind map. Many parents, concept map. The item above, list.
Propositions, not branches
5 min liveJoseph Novak's concept maps look like mind maps from across the room and are a different instrument up close. The difference is one word on every line. A mind-map line says "relates to". A concept-map line says how, and once the line says how, the path through the diagram reads as a sentence.
LiveWhat a concept map does that a mind map cannot3 min▶
Novak's method, developed for teaching science, has four parts, and each one is a thing a mind map deliberately does not do.
- Concepts in boxes. Each idea is a node with a border, not a word on a line. The box is what lets two lines arrive at the same idea from different directions.
- Linking words on the lines. "Needs", "delays", "shares claim with". Concept, linking word, concept is a proposition, and a proposition is something that can be true or false. "Sleeve copy needs Legal sign-off" can be checked with the lawyer. "Packaging: Legal sign-off" cannot; it only says the two are related.
- Hierarchical, top-down. The most general concept sits at the top and the specific ones below it. The page is read downward, along the propositions, rather than outward from a centre.
- Cross-links between branches. A line from one part of the map to a distant part, still carrying a linking word. This is the thing a mind map forbids, and in a concept map it is often where the insight is: the dashed line above says the sleeve and the landing page make the same origin claim, so a change to one is a change to both.
Novak's group at IHMC built CmapTools to draw these. It is named here so you recognise it when a colleague sends you a file from it; the diagram is the subject, not the software.
Self-studyEppler 2006 and Davies 2011, read as a pair4 min▶
Two papers are usually cited when someone wants to settle "which is better", and neither of them does, which is the useful part. Both were read at abstract level from their indexing pages, so what follows is what the abstracts say and no more.
Eppler (2006), Information Visualization. As the abstract puts it, the paper compares concept maps, mind maps, conceptual diagrams and visual metaphors as complementary formats, each with its own advantages and disadvantages. The word to hold onto is complementary. The comparison is not a tournament; it is a description of four tools with four jobs.
Davies (2011), Higher Education. As the abstract puts it, concept mapping, mind mapping and argument mapping differ in structure and purpose, and the differences matter for what each is good at. Argument mapping is the third shape named there: a diagram of claims and the reasons for and against them. It has its own rules and its own literature; it is named here so that when you see one you do not call it a mind map.
Read as a pair, the two papers say the same thing from two directions. The shapes are different instruments. Picking one is a question about the material, not about which diagram is better, and that is exactly the question the cross-link test asks. Anyone who tells you one of these papers proved mind maps beat concept maps, or the reverse, has not read the abstract.
A product team at Daybreak keeps two pages for the autumn launch. The mind map has five branches and answers "what is in this launch" in a glance. The concept map has eleven boxes and about twenty linking words, and answers "what depends on what". When the landing page slipped a week, the mind map showed nothing wrong; every keyword was still in its place. The concept map had a line reading "Landing page - blocks - Launch email", and that was the thing that broke. Two pages, two questions. Neither would have done the other's job.
When a list is the honest choice
4 min liveSession 1 was hard on lists, and rightly, because most lists are a transcript in speaking order. But some material is a list on purpose. Steps, sequences, rankings and checklists carry their order, and a map throws order away. Drawing them radially does not make them richer; it deletes the one thing they were telling you.
LiveThree questions that pick the diagram3 min▶
Ask them in this order, because the first is the one people skip and the most expensive to get wrong.
- Does the order carry meaning? Steps in a process, a ranked shortlist, a launch-day checklist, a timeline. If swapping two items changes what the material says, the order is information, and it stays a list. A map has no first and no last; it will lose that information silently and look finished doing it.
- Do ideas need labelled relations, or two parents? If the cross-link test came back "the relations are the content", or if you keep wanting to write a verb on a line, it is a concept map. Draw the boxes and label the lines.
- Otherwise: one centre, one parent each. What you know about one thing, grouped. That is the mind map, and it is the right answer for most meeting notes, most briefs and most plans, which is why it gets five sessions out of six.
Daybreak's fourteen notes are a mind map; the launch-day runbook that comes out of them is a list; the chart of what blocks what is a concept map. Same launch, three shapes, and none of them is trying to be the others.
Self-studyThe pointer fix3 min▶
Most stowaways turn out to be the first case: the branches were cut a little wrong, and the idea has a natural home once you look. When it does, keep the tree and fix the duplicate with a pointer.
- Pick one home. "Legal sign-off" lives once, under Packaging, because the sleeve is the thing legal actually reviews and the landing page inherits the approved wording.
- Leave a pointer. Under the one home, a short twig reading "see Comms" says where else the idea matters. Two words in a lighter pen. It costs one short token and every node keeps exactly one parent, because the pointer hangs off Legal sign-off and nothing else.
- Do not make the pointer look like the idea. The pointer's label is different from the idea's label on purpose. That is what makes it a pointer and not a second copy.
That last point is also how session 4 sees it. The bench counts "ideas living in two branches" by matching labels across main branches, so the real duplicate, "Legal sign-off" under both Packaging and Comms, counts as one shared idea. The pointer does not count, because its label differs. The fix you make by hand tonight is the fix that moves that number from 1 to 0 next week, and it is the only number on the bench that the picture alone will not show you.
Three tokens, and the middle one is the test. If a verb comes easily, the two ideas are genuinely related and you are either looking at a concept map or at a pointer worth leaving. If no verb comes, the idea was filed under the wrong branch and never wanted two parents at all. Regroup, and the duplicate disappears without a pointer.
Find the stowaway in your own map
★ 22 min · everyone drawsThe map from session 2, with its budgeted branches and keyword labels. Somewhere on it, or somewhere you avoided drawing, is an idea that wanted two homes. Tonight you find it, run it through the three questions, name the shape, and either fix the tree or redraw as what the material really is.
Find the stowaway. Go twig by twig and ask "where else could this go?" Circle every keyword that has a second plausible branch. Then look at the branches you drew in session 2 and find the one you hesitated over. Most maps have one stowaway; a map with four is a map with the wrong branches.
Ask the three questions of the circled idea, in order, on scrap paper. Does its order relative to its neighbours mean anything? Can you write a verb between it and the other branch? If neither, it just wants one home. Write the answer next to the circle: L, C or M.
Name the shape out loud to the person next to you: "these notes are a mind map with one badly filed idea", or "this is a concept map I drew as a tree", or "this part is a list". Saying it is the point. The name is what you take home.
Fix or redraw. If M: cross out the second copy, keep the first, and hang a two-word pointer in a lighter pen under the copy you kept, naming the branch that lost it. If C: on a fresh page, box the four or five ideas involved and write a verb on every line between them. If L: write the items top to bottom, numbered, and leave the map alone.
Read the propositions. For anyone who drew a concept map, read each path aloud as a sentence: concept, verb, concept. Any line you cannot read as a sentence is missing its linking word. For everyone else, read the pointer aloud and check it sends you to the right branch.
Cover the centre and read each branch alone. A stowaway is easiest to spot when you cannot see the whole map, because the second home stops being obvious and the hesitation comes back.
Write the duplicated keyword twice on scrap paper with a blank between the copies. Try to fill the blank with a verb. The blank is the cross-link test in one line.
Before choosing a home, try one regroup. Rename or merge two branches and see whether the duplicate vanishes on its own. If it does, the branches were the problem, and you owe the map no pointer at all.
If you keep the tree, make the pointer visibly different. Lighter pen, smaller letters, the word "see". It must not look like a second copy of the idea, tonight or to the bench next week.
If you redraw as a concept map, keep the mind map too. They answer different questions. Put the two pages side by side and notice which one you reach for when asked "what is in this" and which when asked "what depends on what".
Write the shape's name in the corner of the page: mind map, concept map or list. Then write how many ideas needed two parents before you fixed it. Bring both to session 4, where the second number gets measured.
The most common outcome, and why it is fine. In most rooms the stowaway turns out to be a regroup, not a concept map. Legal sign-off wanted two homes because the branches were departments and legal review is a stage; once you see that, one home is obvious and a pointer covers the rest. That is not a failure to find something interesting. It is the test doing its job: it told you the material was a tree, and it told you where the tree was bent.
Before session 4
25 min- Type session 2's map as an indented outline in a plain text file: the centre on the first line, two spaces of indent per level, one keyword per line. Session 4 needs it in a textarea, and typing it is the first time you will see the map without its picture.
- Run the cross-link test on one map you did not draw. A colleague's, one from a book, one from a slide. Find the idea that appears twice or wants to, and write which of the three cases it is and why. One sentence.
- Find one concept map in the wild: a systems diagram, a dependency chart, an architecture drawing with labelled arrows. Write two of its propositions as full sentences, concept, verb, concept. If a line has no verb you can name, note that too; it is a mind map wearing boxes.
- Write one list you are tempted to map and one sentence on why its order matters. If the sentence will not come, it was a map all along and you can draw it. If it comes easily, leave it as a list and be glad you asked.
Three questions
Clear all three and session 3 gets stamped in your passport.
1 · An idea on your map genuinely belongs under two branches. What does that tell you?
A tree gives every node one parent, so an idea that needs two is not a detail; it is the shape of the material showing through. Exactly one of three things is true, and each sends you to a different diagram. Drawing it twice hides the finding, and a strict mind map has no cross-links, so option D describes a concept map by another name.
2 · What do the linking words on a concept map's lines do that a mind map's lines do not?
"Sleeve copy needs Legal sign-off" is a claim you can take to the lawyer and find true or false. "Packaging: Legal sign-off" only says the two belong together. The verb on the line is the whole difference between the instruments, and it is what lets a concept map carry a cross-link between distant boxes without losing its meaning.
3 · When is a plain list the honest choice, not a failure to map?
Session 1 was hard on lists because most notes are a transcript in speaking order, and speaking order is meaningless. But a launch-day runbook or a ranked shortlist is a list because the sequence is the information. Radial layout has no first and no last, so mapping that material deletes what it was saying. Item count and time pressure have nothing to do with it.
What this session teaches, and where it came from
Every fact on this page, and its verification tier, is recorded in the course's source map.
Session 3 cheat sheet · pin this
Nothing drawn by hand next time. Session 4 is a bench: one outline in a text box, five shapes of the same fourteen notes, and nine numbers read off the drawn map, collisions and off-page labels included. One of the nine is tonight's test as a number. It is called "ideas living in two branches", it reads 1 for the map you brought in and 0 for the one you fixed, and it is the only rung of the ladder the picture will not show you.