On Thursday night you tell Blessing she's opening on Saturday. On Saturday at 8am the shop is locked, Blessing says you told her Sunday, and the customer who came for two cartons of noodles has gone next door.

Nobody lied. The roster was in your head, and a roster in your head is one that each person remembers differently. A duty roster is a page that says who works when, and doing what. Pinned where everyone can see it, it ends that argument before it starts.

Most of the duty roster formats you'll find were made for schools, hospitals and offices. A shop needs something simpler, with one thing those formats leave out: what each person is there to do.

The format

Rule one page for each week. Put the names down the side and the days across the top. In each box, write the hours and the duty.

NameMonTueWedThuFriSatSun

At the top of the page, write the week it covers and who drew it up. At the bottom, leave a line for each person to sign that they've seen it.

Three rules make the format work.

Write real hours. "Morning" means 7am to one person and 9am to another. Write 8 to 4.

Write the duty. In a shop of four, somebody has to open, somebody is on the till, somebody receives the delivery and somebody locks up. If the roster doesn't say who, each of them will assume it's another person.

Write OFF in the box for a day off. An empty box looks like a mistake. OFF looks like a decision.

A filled-in week

Here's an example. The names and hours are invented. The shop is a provision store that opens from 8am to 8pm, Monday to Saturday, and from 12pm to 6pm on Sunday. It has four staff.

Week of Monday 12 October. Drawn up by: Mrs Ade.

NameMonTueWedThuFriSatSun
Blessing8 to 4, opens, till8 to 4, opens, tillOFF8 to 4, opens, till8 to 4, opens, till8 to 4, opens, tillOFF
Tunde12 to 8, till, locks12 to 8, till, locks12 to 8, till, locksOFF12 to 8, till, locks12 to 8, till, locks12 to 6, till
Chinedu8 to 4, receives stockOFF8 to 4, opens, till8 to 4, receives stock8 to 4, receives stock10 to 6, shelvesOFF
AmakaOFF10 to 6, shelves10 to 6, shelves12 to 8, till, locksOFF12 to 8, shelves12 to 6, opens, locks

Read down any column and you can see the day. On Monday, Blessing opens and runs the till, Chinedu receives the delivery, and Tunde arrives at noon and locks up. From noon to 4pm there are three people in the shop, which is on purpose: that's when it's busiest.

Read across any row and you can see the person's week. Everyone has at least one day off. Nobody locks up at 8pm and opens at 8am the next morning more than they have to.

Check it before you pin it up

A roster takes ten minutes to write and two minutes to check. Do the checking.

  1. Every day has someone who opens and someone who locks. Run your finger down each column and find both words. In the sample, Sunday has only two people, so Amaka does both.
  2. The busy hours have enough hands. You know when your shop fills up. Count the people in those hours.
  3. Delivery days have a receiver. If your drinks supplier comes on Monday, Thursday and Friday, somebody is down for it on those three days.
  4. Nobody is in two places. With two shops, this is the mistake that happens most. Write one roster for both shops on the same page, so a name can't appear twice in one column.
  5. Days off are shared fairly. If the same person works every Sunday, they've noticed, even if you haven't.
  6. Everyone has a way home. A sales girl who lives two buses away shouldn't be the one locking up at 8pm every night.

Then pin it up by Friday for the week that starts on Monday, and send a photo of it to the staff group. Have each person sign the bottom. A signature isn't about distrust. It turns "you didn't tell me" into something that can be settled by looking at a page.

When the week changes

It will. For example, someone falls sick, a delivery moves, or there's a burial in the village.

Change the paper, not only the plan. Cross out the old entry with one line so it can still be read, write the new one beside it, and initial it. Tell the people affected yourself. A roster that has been corrected three times in pen is still better than one nobody trusts.

Let staff swap between themselves only if they tell you first and the roster is changed. Two people who swap quietly leave you with a page that says one thing and a shop that does another. If money or stock goes missing that day, your record now points at the wrong person.

Keep the old pages. Clip each finished week behind the new one. At the end of the month they tell you who really worked which days, which helps when salaries or an attendance register are questioned.

What a roster won't do

It says who should be there. It doesn't say who came. For that you need an attendance register, which is a separate book.

It doesn't tell anyone how to do the job. The duty in the box is one or two words. What "opens" involves belongs on an opening and closing checklist, and what the job as a whole involves belongs in a written list of duties.

And it doesn't settle how many hours a person may work or how much rest they're owed. That's between you, your staff and the law. If you're unsure, ask a lawyer before you draw up a pattern you mean to keep.

Paper is enough for one shop with a steady week. It starts to strain when you run two shops, or when the pattern changes often and you find yourself redrawing the page every Friday. We're building a weekly roster into Tabs for that case. Tabs is ours, and it hasn't launched yet. The page above works without it.