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Build a spacing schedule forwards or backwards from a test, stagger several topics, and decide in advance what a missed session means.
Paper packet. Every task here also exists on screen, where it is checked automatically; answers written on paper are not assessed by Nydus. When you are back at a device, enter your answers there.
You will build a spacing schedule with growing gaps and a short check before a test, stagger several topics, and move a missed session without breaking the plan.
Last lesson placed one review between first study and a test, so the gap suited the wait. Real studying needs more than one review, and more than one topic is usually on the go. This lesson builds the whole schedule — several sessions, several topics — and settles in advance what happens when life gets in the way.
| Term | What it means |
|---|---|
| Schedule | Every session for a topic, with its date, written down before the first one happens. |
| Growing gaps | Gaps that lengthen from one session to the next, such as 2 days, then 4, then 5. |
| Stagger | Starting different topics on different days, so their reviews fall on different days. |
| Short check | A brief retrieval session the day before a test: the question list, answered quickly, misses restudied. |
| Missed-session rule | What you decided in advance to do when a session cannot happen. |
A schedule is a list of dates made before the first session. Build it in four moves. Start early: first study as soon as the material is taught, because a schedule that starts three days before a test has nowhere to put its gaps. Let the gaps grow: a short first gap while the material is new, longer ones as it holds — for a test in twelve days, reviews on days 2, 6 and 11 give gaps of 2, 4 and 5. End with a short check the day before, not a cram. Decide the missed-session rule now: move a missed session to the next free day, count the next gap from the day it actually happened, and never double up or drop it.
With several topics, give each its own clock and stagger the starts. Topic A starts Monday, topic B Wednesday; their reviews then fall on different days, and each study day mixes a little of several topics instead of all of one.
Every session after the first is a retrieve-first session from the question list. The schedule decides when; lessons 1 and 2 decide what happens.
Another way: picture
Think of a row of fence posts across a field: close together near the gate, then further apart. Each post only has to reach the next, and the last one stands just before the far wall.
Another way: steps
Distributed practice is one of the two techniques Dunlosky and colleagues (2013) rate as high utility, and spacing is the first recommendation of the IES practice guide (Pashler and colleagues, 2007). Kornell (2009) gave students vocabulary flashcards either as one large stack, so every card came round only after all the others, or as four small stacks studied one after another. The large stack spaces every card, and it came out ahead on the later test.
What is less settled is the exact shape. Studies disagree about whether gaps that grow beat gaps that stay about equal. Growing gaps are used here because they reach a long way with few sessions and match the finding from lesson 3 that longer waits suit longer gaps. Equal gaps of a few days are also a spaced schedule. No gaps is not.
When the test date is fixed, build the schedule from the end. Put the short check the day before. Put the review before it about five or six days earlier, and the one before that about four days before that. Whatever is left is the first study, and if that date has already gone, start today and shorten the first gaps — never drop the reviews to fit.
Keep sessions short. Twenty to thirty minutes on one topic is enough for a question list and its misses; several short sessions on different topics fit in one evening better than one long one.
Illness, a double shift or a family emergency will take out a session sooner or later. That is not the plan failing; it is the reason for the rule. Move the missed session to the next free day. Count the next gap from the day it happened. If that gap is still two days or more, keep the later dates as they are. Doubling up — two sessions of the same topic in one evening — makes the second one a reread, and dropping it leaves one long gap where two were planned.
The College Board holds Advanced Placement exams over two weeks in May. A fictional student, Kim, is taking AP US History and has nine periods of material; the class finishes the last of them in April.
Kim builds a schedule backwards from the exam, one topic to a clock. Each period gets a short check in the last week and a review about two weeks before that. She staggers the periods: Periods 1 and 2 start their reviews in the first week of March, Periods 3 and 4 a week later, and so on. On a typical evening she answers one period's question list and the misses from another — about twenty minutes each. When she misses a Tuesday for a family event, the session moves to Wednesday and the rest of the schedule stays. By May every period has been retrieved at least three times, weeks apart, and none has been crammed.
"I'll space it once I've covered everything." By then there is no room for gaps. Reviews of early topics start while later ones are still being taught.
"I missed Tuesday, so I'll do two sessions Wednesday." The second session of the evening has no gap before it. Move the one session and keep the rest.
"The schedule failed, so start again." A missed session costs one day. Starting over throws away every review already done.
"Studying one topic all week is simpler." It is, and it gives that topic no gaps and the others no sessions. Stagger them.
Mark the first study day and the test day.
Day 0 (Monday): first study of the Civil War unit. Day 12: test.
The schedule has to fit between these two dates.
Place the first review with a short gap.
Day 2 (Wednesday): full question list, blank page first
A short first gap catches the material while most of it can still be retrieved.
Place the second review with a longer gap.
Day 6 (Sunday): misses and a sample of the rest
Four days is longer than two, because the material held last time.
Place the short check the day before.
Day 11 (Friday): question list, quickly; misses restudied
The check the day before is short, and it follows a five-day gap.
Write the missed-session rule beside the schedule.
If missed: next free day; count on from there; never two in one day
The rule is written before it is needed, so a bad week does not end the plan.
Start topic A on Monday and give it its clock.
Cell biology: Mon first study → Wed review → Sun review
Each topic's gaps are counted from its own sessions.
Start topic B two days later.
Genetics: Wed first study → Fri review → Tue review
Starting on a different day puts its reviews on different days.
Read the week day by day.
Mon A · Wed A + B · Fri B · Sun A · Tue B
No day holds two sessions of one topic, and most days hold a little of each.
Mark the dates.
Day 0: first study. Day 10: test.
The schedule fits between these.
Place two reviews with growing gaps.
Day 2 and day 5
Gaps of 2 and then 3 days.
Place the short check.
A fictional student has a history test on day 12 and time for first study plus three revision sessions. Which schedule is the spaced one?
A fictional plan for a history test twelve days after first study. First study is on October 10. Reviews come 2 days later, then 4 days after that, then 5 days after that; the test is the day after the last one. Complete the worked dates.
Add 2 days to the first study date.
Review 1: October a
The first gap is short, because the material is newest.
Add 4 days to review 1.
Review 2: October b
Count from the review before, not from the first study day.
Add 5 days to review 2.
Short check: October c; test the next day
The last session is a short check the day before the test, not a cram.
A fictional student studies two chemistry topics. Topic A is first studied on day 5, topic B 3 days later. Each topic gets a review 2 days after its first study and another 4 days after that. Fill in the day of each session.
| Day | |
|---|---|
| Topic A, first study | 5 |
| Topic A, review 1 | |
| Topic A, review 2 | |
| Topic B, first study | |
| Topic B, review 1 | |
| Topic B, review 2 |
A fictional student's biology test is on November 20. She plans backwards: a short check 1 day before the test, a review 6 days before, a review 10 days before, and first study 12 days before. Fill in the date of each session.
| Date in November | |
|---|---|
| First study | |
| Review 1 | |
| Review 2 | |
| Short check |
A fictional schedule. A review of the Civil War unit is due on day 7 and the next one on day 13. The student is ill on day 7. Using the rule from this lesson, on which day does the missed review happen, and how many days is the gap from it to the next review?
Missed review happens on day a
Gap to the next review: b days
A fictional community-college student works evening shifts on **Tuesday and Thursday** and cannot study those days. He first studies a psychology chapter on **Monday**. His plan: a review at least 2 days later, another at least 3 days after that, and a short check at least 4 days after that — each on the first day the gap allows that is not a work day. Choose the weekday of each session.
| Weekday | |
|---|---|
| Review 1 | |
| Review 2 | |
| Short check |
Lesson test: one question per skill, one attempt each, no hints. Your answers are checked when you submit.
A fictional student has a history test on day 12 and first studies the unit on day 0. Build the schedule: reviews 2 days after first study, 4 days after that, and 5 days after that. Fill in each session's day and what kind of session it is.
| Day | Kind of session | |
|---|---|---|
| Session 1 | ||
| Session 2 | ||
| Session 3 | ||
| Session 4 |
You can lay out a schedule for a real test. Take the next test you have, write its date, and put every session for one topic on your calendar now, with the missed-session rule beside it. Next: mixing the kinds of problem in one session. You can stop in the middle of any of this. Closing the page is the whole of stopping — your place and anything you had typed are already saved, and the lesson opens again where you left it.
12. Your turn: a test on day 10, step 3
Day 9: short check
The day before, after a four-day gap.