What's missing from a slide
Open any lecture slide and list what isn't on it. The causal connection between the bullets. The example the lecturer gave. The caveat they mentioned but didn't write. Which of the six items is examinable and which is context. Why this slide follows the previous one. That's most of the lecture, and none of it survives in the file.
This is why students who "have all the slides" often perform worse than expected: possession of the deck feels like possession of the content, and the gap only becomes visible when a question requires the connective tissue rather than the bullets.
Reconstruct in the same week, not in April
The reconstruction is cheap while you still remember the lecture and expensive once you don't. Twenty minutes the same day gets you a usable set of notes; the same job in revision week means re-learning the material from a textbook, which takes hours and produces something in the textbook's framing rather than your lecturer's.
If you can only do one piece of term-time work, do this one. It's the highest-return twenty minutes in the week and it's what how to organise lecture notes is ultimately in service of.
The conversion
- 1
Go through the deck once and mark each slide: core, context, or example
Two minutes. Most decks are about 40% core. Everything after this step happens only to the core slides, which is what makes the process fast enough to actually do weekly.
- 2
For each core slide, write the sentence the bullets were fragments of
One or two full sentences, prose, with the causal words the bullets dropped — because, therefore, unless, only when. Those words are the content. A bullet list without them is a set of nouns.
- 3
Add what the lecturer said that isn't on the slide
The example, the aside, the "this always comes up". If you attended, you have perhaps a day before this is gone. If you have the recording, this is what to scrub for — not a full re-watch.
- 4
Mark the examinable claims explicitly
A star, a colour, whatever. You're deciding now, while you have the lecturer's emphasis in your head, so that revision-you doesn't have to treat all forty slides as equally important.
- 5
Convert the starred claims into questions
This is the step that makes the notes survive. A reconstructed explanation you re-read decays like anything else; a question you can be tested on doesn't. Five to fifteen questions per lecture.
- 6
File it where the review queue can reach it
Notes in a folder you never open are a diary. The questions need to end up somewhere that surfaces them again without you deciding to go looking.
Deck types need different handling
| Deck style | The problem | What to do |
|---|---|---|
| Three bullets per slide | Almost all content was spoken | Reconstruction is the whole job. Use the recording if you have one. |
| Dense text, paragraphs on slides | Nothing missing, but nothing processed either | Skip reconstruction, go straight to compression and questions. |
| Diagram-heavy | The diagram was explained by pointing | Redraw each diagram from memory and annotate the arrows in words. |
| Equation-heavy | Derivation steps skipped on the slide | Fill in every skipped line yourself. The skipped lines are the exam. |
| Copied textbook figures | Nothing is the lecturer's own emphasis | Find what they added verbally; that's the only signal about what's examinable. |
The recording, used properly
If lectures are recorded, the temptation is to re-watch at 2x. That's a four-hour week and it's passive — the lowest-yield activity available. Use the recording as a lookup instead: convert the deck first, and only scrub to the timestamps of the slides where your reconstruction stalled.
A transcript changes this materially, because it makes the recording searchable — you can find where the lecturer explained slide 14 in fifteen seconds instead of scrubbing for five minutes. How to use recorded lectures covers the whole workflow; the lecture note taker exists specifically to produce the transcript this depends on.
What good converted notes look like
- Shorter than the deck, not longer. If your notes are longer than the slides you've transcribed rather than processed.
- Written in sentences, because sentences carry the causal direction that bullets lose.
- Explicitly ranked — you can see at a glance which five claims per lecture matter.
- Attached to questions, so the notes have a job after the first read.
- In your own words wherever possible, since the translation is where the understanding happens and the verbatim version is where it doesn't.
Don't convert every deck
Some modules are assessed by coursework, some lectures are optional context, some decks are genuinely just the textbook. Converting everything evenly is how the habit dies in week five. Rank your modules by exam weight, convert the top two properly and skim the rest — an uneven system you maintain beats a complete one you abandon, and this is the same triage logic that governs one-week revision, applied earlier and more calmly.