How to study from lecture slides (without just rereading them)

Lecture slides are the closest thing you have to the exam blueprint, and they are the worst possible thing to revise from. Every slide is a compression of ten minutes of talking into six bullet points, and the part you need, the why between the bullets, was said out loud and never written down. This guide covers what slides leave out, how to prepare a deck for study, a five-step routine that turns a deck into notes you made and a quiz you took, a worked example on one lecture, how to use the figures, and what to do when the deck is thin or the lecturer went off script.

What a slide deck leaves out

A good lecturer uses a slide as a prompt. The slide says "Frank-Starling mechanism" and three bullets; the lecturer spends four minutes explaining what stretches, why it matters, and the exam-style trap in it. You were in the room and it made sense. Three weeks later the slide is all that survives, and the three bullets are a list of nouns with no verbs between them.

So the slides are missing the explanation. The second problem is that reading them feels like studying. Dunlosky and colleagues' review of ten study techniques rated rereading as low-utility, with the gains fading after the first pass [1], and slides are the easiest thing in the world to reread, because each one takes four seconds. You can get through a deck in ten minutes and remember none of it, feeling confident the whole way.

The job has two halves. Rebuild the explanation the slides compress away, then stop reading and start recalling. The deck is the input to both.

Before you start

• Export the deck as a PDF. Bord reads PDFs, images, audio and video. PowerPoint, Keynote and Google Slides all export to PDF in one menu, and one PDF per lecture keeps things tidy. Export with the speaker notes if the lecturer left any in; they are often the missing explanation.
• You need an account. Files are uploads and guests cannot upload. The Free plan includes it, with Google sign-in.
• Check the size against your plan. Free takes up to 100 pages and 50 MB per file, with three files per board. Plus takes 500 pages and 250 MB with five per board. A single lecture is well inside Free. A term's worth of decks is a Plus-sized job, or one board per week on Free.
• Add the recording if you have one. If you recorded the lecture, or used Live Notes in the room, put the audio on the same board as the slides. The recording has the explanation the slides are missing, and Bord cites it to the timestamp.
• Image-only slides are fine. Slides exported as pictures, or photographed off a screen, are read as images. They take a little longer to index.

The routine

1. Drop the deck on a boardDrag the PDF onto the canvas. Bord uploads it, checks it for malware, reads and indexes every slide, and cuts out the figures. A card for the file appears; click it to preview the slides beside the board. Nothing has been explained yet. You have just made the deck searchable.
2. Get the explanation back, slide by slideSwitch to Tutor and ask it to teach the lecture. Each file gets its own lesson plan, so Tutor goes through the deck in the lecturer's order, out loud, drawing on the board as it speaks, and stops at checkpoints to see whether you followed. Interrupt wherever a slide was a list of nouns to you. Every claim it makes cites the slide it came from, so you can check it against the deck. If you would rather read than listen, use Ask to lay out slides 12 to 20 instead. One pass. The second pass through an explanation is where rereading starts again.
3. Write it back without lookingClose the preview and scroll the explanation out of view. On a blank patch of the board, rebuild the lecture from memory in boxes and arrows: the mechanism, what causes what, the one trap the lecturer warned about. Then bring the AI's version back beside yours and compare. Every arrow you could not draw is a gap. This step is the one students skip and the one that does most of the work; Chi and colleagues found that students who explained material to themselves while studying understood it markedly better than students who read it twice [2].
4. Get tested on the deck, not on the subjectSwitch to Quizbook and ask for a quiz on this lecture, with written questions as well as multiple choice. The questions come from the slides you uploaded, in the lecturer's framing, which is what the exam will use. Written answers are graded on the reasoning; a diagram question asks you to label or draw on the board. Every miss links to the slide that covers it. Reread that one slide and fix your own note.
5. Come back in three daysOpen the board, redo step three on a fresh patch, and ask for another round of questions. Quizbook targets what you missed last time. Forgetting between sessions is what makes the second recall count, and Cepeda and colleagues' synthesis of 254 studies found that spacing study beats massing it in nearly every condition tested [3]. By the exam, the board is a map of the lecture that you drew, with the hard parts marked.

The point of the routine is where the AI sits in it. It does the labour in steps one, two and four: indexing, explaining, writing questions, grading, finding the slide. You do the learning in steps three and five. Step three is not optional. Reading a perfect explanation and feeling that you understand it is the exact failure the slides already gave you, with better prose. There is a longer post on keeping the recall yours; this routine is that rule applied to one deck.

A worked example: one lecture, 42 slides

Say the deck is a second-year physiology lecture on the cardiac cycle: 42 slides, six of them diagrams, one Wiggers diagram that the lecturer spent a quarter of the hour on. Here is what the routine produces.

Compare that to the alternative: reading the 42 slides four times in the week before the exam, which takes about the same hour and leaves you with a feeling.

The figures are the exam

Lecturers put diagrams on slides because the diagram is what they want you to be able to reproduce. Bord cuts every figure out of the deck and places the original on the board with its caption and slide number, so you can drag the Wiggers diagram beside your own attempt at it instead of glancing at it on slide 19.

Use them two ways. First, pairing a drawing with the words that explain it is the condition under which people learn best from a lecture; Mayer's multimedia research is clearest on exactly this, words plus a relevant picture beat words alone across dozens of experiments [4]. Keep the explanation beside the figure rather than on a separate slide. Second, make the figure a question. Ask Quizbook for a diagram question and it will hand you the figure with labels removed and ask you to mark, drag or draw the answer on the board. Reproducing a diagram from memory is the exam task, so practise the exam task.

When the deck is thin, or the lecturer went off script

• The slides are six words each. Some lecturers use slides as a prop. The recording matters more than the deck here; put the audio on the board and ask Tutor to teach from both. Without a recording, use Ask to explain the slide using the textbook chapter as a second source, so the explanation is still cited to something you can check.
• The lecturer said something not on the slides. If you wrote it down, put your note on the board and link it to the slide it belongs to. Any note can link to a page of a file. If you did not, that is the case for Live Notes next time.
• The deck is 300 slides for the whole module. Split it by lecture before uploading. Most PDF readers export a page range. Or move to Plus, which takes 500 pages in one file.
• The explanation seems wrong. Follow the citation to the slide and decide. If the slide is ambiguous, use Ask to look it up on the web; it places the sources on the board. Catching the AI out is a recall exercise in itself.
• Half the slides are formulas. Ask Tutor to derive one on the board rather than explain it. Then derive it yourself on a blank patch, which is step three for maths.
• You have hit the weekly allowance. Every plan shares one weekly pool across explaining, pictures, voice and quizzes, and it resets on Monday. Reading and quizzing from a deck is cheap; voice teaching through a whole hour is where the pool goes.

Questions