Open a notebook from last term and read it the way you would with ten minutes to spare before an exam. If every word is the same blue ink, you have to read all of it to find the three things that matter: the definition that keeps slipping, the task you never handed in, the question you meant to ask. Colour-coding solves that. It only fails when the system is so elaborate that keeping it going takes longer than writing the notes did.
What Colour Coding Should Actually Do
Most of what fills a notebook is working text. It explains, connects and fills gaps, and you will read it once or twice. A small share is load-bearing: the headings that hold a topic together, the jobs you have agreed to do, the points you have not understood yet. Those are the lines you come back for, and those are the lines colour should mark.
A system worth keeping passes two tests. You can tell what a colour means without turning back to the key, and marking something takes no longer than underlining it. If either test fails, the system is doing too much and it will quietly disappear from your notes within a fortnight.
If you have to check the key, the system is too complicated.
A Simple Three-Colour System
Three jobs, three colours. Nothing else gets marked.
- Colour one — subject. Titles, section headings and the topic label at the top of the page. Dark ink works best, because you still need to read it comfortably. This colour is how you find your way around the notebook.
- Colour two — action. Anything you have to do: read a chapter, send an email, book a room, ask a tutor, buy a replacement pen. Mark it in the margin with a small box so you can tick it off later.
- Colour three — question. Anything you do not understand, disagree with, or want to check. A question mark in the margin, plus a note to yourself if the point is not obvious.
A page of notes on pricing might carry a green title, an orange box beside "check the reading before Thursday", and a pink "why does demand shift when income falls?" in the margin. Three marks on a full page. That is the whole system working.
Choosing the colours
Pick three pens you can tell apart at a glance and keep them clipped to the same notebook, so the choice is already made when you sit down. A pale highlighter on white paper is easy to miss in a hurry; a fine-tipped pen in a strong colour is quicker. If you take notes on a tablet or in an app, set up the same three highlighters or tags and use them across every subject — a pink question should mean the same thing everywhere.
If you or a reader is colour-blind, do not let colour carry the meaning alone. Pair each one with a shape: a box for actions, a question mark for questions, capitals for headings. Colour then becomes a shortcut rather than the only clue.
Set It Up Once, Then Forget It
Write the key on the inside front cover of the notebook: three lines, three colours, three meanings. Keep the wording blunt — "green: topic", "orange: to do", "pink: ask". It takes a minute and saves an argument with yourself three weeks later, when you cannot remember whether the blue was for definitions or deadlines.
The one rule that matters: mark as you write, not afterwards. Going back through a week of notes with a highlighter feels productive and achieves very little, because once a topic is finished everything on the page looks important. Marked in the moment, the colour records what you actually thought: this is the shape of the topic, this is a job, this is a gap.
Reviewing With Colour
This is where the time comes back. Instead of reading the page from the top, work through it in order of usefulness.
- Read the subject colour only. Skim titles and headings to rebuild the structure of the topic. On a dense page that takes seconds, and it shows you straight away whether a whole section is missing.
- Answer the questions. Cover the body of the page, answer each question aloud or in the margin, then check. These are the points you had already noticed you did not know, which makes them the most valuable lines in the notebook.
- Clear the actions. Turn every box into a line on your to-do list, or tick it off if it is already done.
- Read the rest last. Read the working text only where a question or heading shows you need it. Date questions as you answer them and leave the mark in place; a page of answered questions is a clear sign of progress.
Where Colour Coding Goes Wrong
- Too many colours. Five colours with five meanings is a code to memorise, not a shortcut. Cap it at three for a subject notebook, or four if you genuinely need a separate colour for quotations.
- Changing meanings. If pink means "question" in one notebook and "important" in another, the system stops working. Fix the meanings and keep them.
- Colour instead of structure. A solid wall of text with no margins, gaps or headings cannot be rescued by ink. Space does more for readability than highlighter does.
- Decorative highlighting. Marking for the sake of it leaves pages that look studied and read exactly as they did before.
- Colour as the only signal. Red and green side by side are hard to separate for many readers. Add the box and the question mark, and the page works for everyone.
Make It Work This Week
Start smaller than feels necessary. Tonight, choose three pens and write the key inside the front cover of the notebook you are using now. At your next set of notes, mark only the title, one action and one question as you go — enough to prove the habit. When you next review, begin with the questions and work backwards through the page.
If you drop it for a week, do not rebuild the system or buy a new notebook. Carry on from the next page with the same three colours. The point was never tidy notes. It is being able to open a notebook and find what matters without reading every word again.
Photo: Engin_Akyurt / Pixabay
