Etched
The Cognitive Science of Studying Less and Remembering More
Most students study by rereading. It is the most popular technique and one of the least effective, and the reason it survives is that it feels like it is working. This book is about the methods that actually hold — and how to tell the difference from the inside.
Try it now
This shows you the difference between what you recognise and what you can actually produce. About 1 minute
- Pick something you studied this week.
- Close your notes. Really close them.
- Write down everything you remember, until you run dry.
An exam asks you to produce, not to recognise. This is a one-minute test of which one your studying has been building.
Think of something you studied this week. Close your notes. Write down everything you remember.
What is in it
Twenty-nine chapters in six parts. Every technique is tied to a named published study, listed in full at the back so you can read it yourself.
- I Why your studying is not working Why rereading feels productive, and the five things you were told that are not true.
- II The core four Retrieval, spacing, interleaving, elaboration. Adopt these and you can stop there.
- III Seven techniques you have not been taught Failing a test before you study. Drawing. Sleep as a study session. Judging your learning late.
- IV Playbooks by subject Memorization-heavy courses, problem-based courses, dense reading, and long writing.
- V The system around the studying Notes, attention, procrastination, test day, study groups, returned work, and using AI without undoing your own learning.
- VI Putting it together A thirty-day plan of one change per week, sequenced so it survives a bad week, plus the printable trackers to run it with.
Free tools from the book
These run in your browser. The calculator sends nothing anywhere; the inventory scores itself on this page and asks for an email address only if you want the result sent to you.
Spacing calculator
This works out when to review something so that it sticks, instead of leaving it to chance. About 30 seconds
- Enter your exam date, and the topic if you want it named.
- Get back a handful of review dates, spread out on purpose.
- Keep them: email them to yourself, tap a date to add it to your calendar, or copy them.
Studying the same material further apart beats studying it more. Each review is a closed-book recall, not a reread — put the material away first.
Cepeda and colleagues (2008) found the best gap between study and review is a proportion of the time until you are tested — around a quarter of it when the exam is days away, closer to a tenth when it is months away. This works that out for you, then widens each following gap.
Keep these dates
Using Google Calendar? Tap any date above to add just that review.
Where should you start?
Most students are not failing across the board — they are failing in one or two specific ways. The inventory below scores four habits separately and tells you which chapters apply to you.
Study Habits Inventory
This tells you which of four study habits is costing you the most, so you know what to change first. About 5 minutes
- Rate each of the 24 statements for how true it has been of you over the past month.
- Answer as the student you are, not the one you intend to become.
- Get four separate scores and the chapters that address your highest one.
Most students are not studying badly across the board — they are studying badly in one or two specific ways. One overall score would not tell you which.
The scoring happens in your browser. Your answers to the individual items are never sent anywhere — only the four totals, and only if you ask for the result by email at the end.
Scale: 0 never · 1 rarely · 2 sometimes · 3 often · 4 almost always
Passive encoding
Massed scheduling
Attention fragmentation
Poor calibration
This measures habits you report, not how much you have learned. A falling score means your behaviour has changed, which is the part you control. Score yourself again after thirty days.