Mahesh's Milk Quality Check

Five milk questions on the shared counter phone each morning, so the boys learn to judge grade, smell and cold without calling Mahesh.

Who this is for

Mahesh Kulkarni runs a dairy and paneer counter off Amrai Road in Nashik. Two hundred litres of buffalo milk lands at 5:40 am, the paneer is set by nine, and sixty regulars come for curd by evening. Sandeep and Irfan take the cans while Mahesh is at the bank. Last Tuesday a can that smelled off went into the vat, and eleven kilos of paneer went to the dogs.

How the job is done today

Mahesh taught both boys once, standing at the can, holding the lactometer up to the light. There is a yellowed chart behind the fridge that nobody reads any more. When he remembers, he shouts a question across the counter: what does 27 mean, why is this one frothing. Sandeep answers, Irfan guesses, and the rest gets learnt by ruining something. Mahesh has typed the same six warnings into the shop WhatsApp group so many times that they have scrolled out of reach.

The screens, in order

1. Tap your name — Lets whoever picks up the counter phone say who they are without a password, because four people share it and hands are wet at that hour.
2. This morning's five — Asks five short questions, one at a time, about the milk actually standing in front of him.
3. Why that was wrong — Gives Mahesh's own explanation for a wrong answer, so the mistake gets understood instead of just marked.
4. What Sandeep keeps missing — Shows Mahesh which questions each boy still gets wrong, so he knows what to stand and watch that week.
5. Add a question — Lets Mahesh turn whatever went wrong in the shop this morning into tomorrow morning's question.

What it keeps track of

• People at the counter — name, what part of the work he handles, which questions he still gets wrong
• Questions — the question, the choices, the right one, Mahesh's explanation, whether it is about grading, spoilage or keeping cold
• Mornings answered — who answered, which day, which questions came up, right or wrong, how long the whole thing took
• The repeat pile — whose it is, which question, how many mornings it has come back, whether he has now got it twice

The one decision that matters

The one thing to get right is how the phone knows who is answering. One way is a separate login with a password for each person. The other is a list of four names, and you tap yours. Tap the name. The phone sits on a wet counter at 5:40 am with a queue forming, and a password will either be forgotten or written on the wall beside it, which makes it pointless anyway. There is nothing here worth locking. If Irfan taps Sandeep's name by mistake, Mahesh can move that morning across from his own screen. What needs protecting is two minutes of the morning, not the answers.

What to leave out of the first version

No marks, no ranking, no month-end report. The moment Sandeep sees he is on sixty and Irfan on eighty, he starts tapping the safe answer instead of the honest one, and then the wrong answers stop coming back, which is the only part that matters. Also skip picture questions. A photo of milk on a phone screen at dawn teaches nothing that the open can in front of him does not.

How you would know it worked

One morning Irfan turns a can away at the gate before Mahesh has reached the shop, and can say why: the smell at the neck, the lactometer sitting too low, the froth that will not settle. He did not phone to ask first.

Build it

Paste this in and let it run.

I run a dairy and paneer counter in Nashik and two boys handle the milk cans every morning. Make me a website for the one phone we keep at the counter, where whoever is standing there taps his name from a short list, no password, and gets five quick questions about milk: what lactometer reading to accept, how a can that has been standing too long smells, what happens when soured milk is boiled, how cold the room must be for curd to set. If he answers wrong, show my explanation in my own words and bring that question back the next morning until he gets it right twice. Let me add a new question myself whenever something goes wrong in the shop, and let me see which questions each boy keeps missing. It must finish in two minutes, because the milk is waiting.