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The capacity you correct based on what actually happened, not what you expected
The course wraps up with you adjusting each slot's spots based on the turned-away requests and empty slots from the past few weeks, not the number you set on day one.
By Yodai · Published September 6, 2026 · Updated October 12, 2026
Setting your capacity, your buffer time, when to bundle open slots together, and when to cancel them is just the start: those numbers get corrected by the real schedule, week after week. You set four spots for Thursday's class on day one because it seemed like a reasonable number. Six weeks have gone by. Two people got turned away from that same class, and Tuesday's sat empty four times. Do you raise the spots, lower them, or just adjust Tuesday and leave Thursday as it is?
The same thing happens to a hair salon that books in half-hour slots, or a shop that schedules appointments to check your car: the first capacity number is always a reasonable guess, not an exact calculation. The usual approach is to first set how many fit at each table, class, specialist, or machine, and how much buffer you leave between one booking and the next so they don't overlap. That math happens on paper, worked out before you open the calendar, based on what physically fits in the space or the hour.
Nobody gets that number right on day one. You correct it by looking back at the weeks you've already lived through, not by imagining what's ahead.
Two signals, two opposite corrections
A turned-away customer is the signal that you're short on capacity. Someone messaged you, wanted to book, and you couldn't give them the slot. Write it down, and it stops being a feeling and becomes a number: three turn-aways for Thursday's class in a month carry weight. Just one doesn't; it could have been a coincidence.
An empty slot is the opposite signal. You opened a time slot and no one booked it in time, or fewer people showed up than it can hold. Here you have more capacity than you need: if six spots never fill, you're better off with fewer.
Think of a restaurant with one big table that seats eight. If that table sits with just two people almost every Tuesday night, you've got six seats' worth of cost that nobody's paying for that night. And if on Saturday you turn away parties of eight because you only have one table like that, then you really are short on capacity, even if the rest of the week has plenty to spare.
The mistake that ruins the correction is lumping the two signals into one count. If you're turning people away on Thursday and sitting empty on Tuesday, each slot calls for a different move. Raising capacity for the whole week because you turned someone away one day leaves Tuesday even emptier. Lowering Thursday's capacity because Tuesday has room to spare leaves Thursday's customers without a spot even sooner.
- Raise the capacity for that specific slot, not the rest of the schedule
- Raise it one spot at a time, never double it all at once
- Only if the turn-away repeats for three weeks in a row, not the first time it happens
- Lower the capacity, or remove the slot entirely if it's been empty for a full month
- Lower it one spot at a time too, so you don't overcorrect in the other direction
- Don't offset it by raising the price on the slot that does fill up: those are different slots
- First check whether the problem is the time slot, not just the number of spots
Which one do I pick: You always start with the turn-away: losing a customer because you had no room costs more than an empty slot. You deal with the empty slot later, with less urgency, since nobody walked away upset over it.
The test before you touch anything
One week isn't data, it's noise. It could have been a holiday weekend, bad weather, or it happened to line up with a promotion you ran that week. You need to see the same pattern repeat with no explanation other than capacity. Three or four weeks in a row with the same turn-away, or the same empty slot, is a correction backed by evidence. Before that, you write it down and wait.
This works the other way too. If Thursday's turn-away only showed up the week you ran a WhatsApp promotion, then the promotion explains the spike, not your everyday capacity. The fix is to repeat the promotion when it suits you, not to raise the spot count every week.
Think in proportions, not in the first scare. If out of twenty bookings this month only two people got turned away, that's a small margin and it might not even be worth touching. If you turned away six out of twenty requests, then you really are short on room.
Some businesses go six weeks without turning anyone away or ever sitting fully empty: the capacity you set on day one turned out to be reasonable. There, you don't touch anything, and that's a valid decision too. Adjusting for the sake of adjusting, with no signal calling for it, costs just as much as failing to adjust when it's needed: you add noise to a system that was already working and lose track of which capacity number was the right one.
The one case where it's worth changing something even without a turn-away or an empty slot is when you switch seasons or offerings. If you add a new class in the summer, or the auto shop starts doing tires in addition to checkups, the old capacity no longer describes the business you have now. There, you set capacity from scratch, just like the first week you opened your calendar, instead of waiting weeks for data that won't help anyway for a service you just launched.
How you fix it, in practice
With the notebook already filled in, the adjustment itself is mechanical. It calls for order and patience: don't touch two slots at once, even if you're itching to fix everything in one afternoon.
- 1Write it down
For three or four weeks, log every turn-away and every empty slot, with the date, the time, and the exact slot where it happened. Without that date, the data can't tell a real trend apart from a one-day coincidence. - 2Separate them
Don't add turn-aways and empty slots in the same column. They call for opposite corrections, and mixing them into one number gives you a figure that means nothing and doesn't tell you which slot to fix. - 3Raise it where you're short
If a specific slot racks up turn-aways week after week, raise its capacity by one spot and check back in three weeks before touching it again. If the turn-away continues, add another spot; if it stops, leave it alone. - 4Lower it where you have too much
If a specific slot sits empty month after month, lower it or cut it outright, without touching any other slot in the schedule at the same time. A slot that never fills up gets fixed by removing it or moving it to a different time, not by lowering the price on everything else. - 5One slot at a time
If you change two slots at once, you won't know which one had the problem, and your next correction will start from a guess instead of data. Wait to see the effect of the first change before touching the second.
- The capacity for each time slot, adjusted based on what actually happened, not the number you set on day one
- Turned-away customers and empty slots are two different problems: each one calls for the opposite fix
- A notebook with three or four weeks of data before you touch anything
- The slot with the most turned-away customers fixed first, the one that stays emptiest next, one spot at a time
Three cases to decide
Answer before opening each one. If one gives you trouble, go back to the section that explains it.
1. You've had five weeks with Thursday's class full, and two turned-away customers total: one in week 2 and one in week 5. Do you raise Thursday's capacity?
Not yet. Two turned-away customers three weeks apart, without repeating, isn't the pattern that calls for a change: it could just be noise. Wait until it repeats three or four weeks in a row before you touch the capacity.
2. The 9:00 court has spent two months with two players booking out of a capacity of four, and it's never turned anyone away at that hour. On one specific day, when there happens to be a neighborhood tournament, it fills up and you turn away three pairs. What do you fix?
You lower the regular 9:00 capacity, because the two-month pattern is what counts. Tournament day is a one-off with a known cause, and it doesn't call for raising the standard capacity: if it happens again for another tournament, you handle it separately, not by changing the everyday slot.
3. You've got two problem slots at once: the spa turns people away on Fridays, and the group room sits empty on Tuesdays. You want to fix both this same week by raising Friday's capacity and lowering Tuesday's at the same time. Do you do it?
Not at the same time. You change one first, starting with Friday's turned-away customers, since that costs you a lost customer, and wait before touching Tuesday. If you move both slots in the same week, you won't know whether the improvement or the setback that follows came from one change or the other.
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