You are doing the same thing. Same recipe, same brand of flour, same scale, same oven. And the pizza is different, sometimes markedly so, and there is no pattern you can see.
You are not doing the same thing. You are doing the same procedure while at least six variables move underneath it, none of which your recipe mentions and most of which you cannot see.
Here they are, in rough order of how much damage each does, with a way to check each one.
The illusion of doing the same thing
A recipe describes actions: mix these, wait this long, shape, bake. It does not describe conditions, and conditions are what determine the outcome.
Two people can perform identical actions and produce different dough because their kitchens, their flour, their mixing, and their ovens were in different states. So can the same person in January and July.
This is not a counsel of despair. Every one of these is measurable, and once you are measuring them the randomness largely disappears.
Variable one: finished dough temperature
The biggest single contributor, and the one almost no recipe mentions.
Fermentation responds to the temperature of the dough, and your dough's starting temperature depends on your ingredients, your room, and the heat your mixing adds. Mix a little longer, use water straight from a warmer tap, work in a warmer kitchen, and you finish mixing at a different temperature. Every subsequent time in the recipe is now wrong for you.
How to check. Take the temperature of the dough in the centre of the mass when you stop mixing. Write it down. If that number moves between bakes, you have found your biggest variable.
How to control it. Adjust your water temperature to hit a target, once you know how much heat your own mixing adds. The method is in desired dough temperature.
Variable two: the temperature the dough sat at
Second biggest, and closely related.
A schedule written as a duration assumes a temperature. Your kitchen in winter and your kitchen in summer are not the same environment, and neither are two different spots in the same kitchen. A dough on a counter near an oven that has been on is fermenting faster than one in a cool corner.
How to check. Note the room temperature at the start of the bulk, and note where the dough sat. If you are retarding, find out what your fridge actually runs at, because "in the fridge" is not a temperature.
How to control it. Write a temperature next to every stage in your schedule and adjust the duration when the temperature differs. The model is in fermentation is time and temperature.
Variable three: flour lot and age
Flour is an agricultural product. Absorption and behaviour vary between production runs of the same named product, and flour that has been open for months is not the same as a fresh bag.
This is the variable people find hardest to believe until they hit it. A formula that has worked reliably for a year suddenly produces slacker dough, nothing has changed, and the answer is that the bag changed.
How to check. Record the flour brand and, where it is printed, the lot or best-before date. When a familiar formula behaves oddly, that record is the first place to look.
How to control it. You mostly cannot, and that is fine. What you can do is recognise it rather than adjusting your whole process to compensate for something that will change back. Adjust hydration by feel and note that you did.
Variable four: yeast or starter activity
Commercial yeast loses viability with age and with how it has been stored. A starter's vigour varies with how recently and how well it was fed, and with the temperature it has been kept at.
The same weight of yeast is not the same amount of fermentation power from one bake to the next, particularly at the extremes: yeast near the end of its life, or a starter that has been neglected and then fed once.
How to check. Note the age of your yeast and, for a starter, when it was last fed and how it behaved. If your dough is consistently slower than the schedule expects, this is a strong candidate.
How to control it. Buy yeast in quantities you will use, store it as the manufacturer directs, and feed a starter on a schedule you actually keep. Format differences are covered in converting between fresh, active dry, and instant yeast.
Variable five: mixing time and method drift
Mixing develops structure and adds heat. Both matter, and both drift.
Very few home bakers mix for exactly the same duration at exactly the same intensity every time. On a busy evening you mix a little less. When you are enjoying it you mix a little more. Neither feels significant and both change the dough.
How to check. Time your mixing rather than estimating it. If you use a machine, note the speed and duration.
How to control it. Pick a method and keep it. If you change mixer or switch between hand and machine, expect the friction factor from the dough temperature calculation to change too.
Variable six: oven recovery between pizzas
Not a dough variable, but it belongs on the list because it produces differences between pizzas within a single session, which people often misattribute to the dough.
Your baking surface gives up heat to each pizza. The second pizza launched immediately after the first bakes on a cooler surface than the first did. By the fourth, the difference can be substantial.
How to check. Is the first pizza consistently better than the later ones? That is recovery, not dough.
How to control it. Allow recovery time between bakes, and know that recovery speed differs by surface. See baking steel vs pizza stone and why your pizza base is pale and floppy.
The summary table
| Variable | Damage | How to check |
|---|---|---|
| Finished dough temperature | High | Probe the centre of the dough at the end of mixing |
| Temperature during the schedule | High | Note room and fridge temperatures, and where the dough sat |
| Flour lot and age | Moderate | Record brand and lot; look here when a familiar formula shifts |
| Yeast or starter activity | Moderate | Record age of yeast, or when the starter was last fed |
| Mixing time and method | Moderate | Time it rather than estimating |
| Oven recovery | Moderate, within a session | Is pizza one better than pizza four? |
Why you cannot diagnose without a record
Six variables, most of them invisible, several of them moving at once. Memory reconstructs perhaps two of them accurately and quietly invents the rest.
The fix is unglamorous: write it down. Not everything, and not in detail that makes it a chore. The minimum that lets you compare two bakes is a short list, and it is in how to log a bake so you can actually repeat it. Copy that field list onto a sheet by the bench if that suits you better than a phone.
Then change one variable at a time. That rule is the whole method, and it is worthless without a record to compare against.
Mistakes to avoid
Adjusting the recipe to compensate for an unidentified variable. This is how formulas end up adjusted five times in five directions.
Blaming your technique first. Technique matters, and it is rarely the explanation for week-to-week swings when your actions have not changed.
Changing two things because you are impatient. You will learn nothing from the result and you will have lost the bake as a data point.
Assuming the flour is constant. It is the variable people trust most and it moves more than they expect.
In Plain English
Week-to-week inconsistency in a familiar dough recipe usually comes from six uncontrolled variables: finished dough temperature, the temperature the dough sat at, flour lot and age, yeast or starter activity, mixing drift, and oven recovery between pizzas. None of them appears in a typical recipe and most are invisible without measurement.
This is for anyone who believes they are doing the same thing each time and cannot explain why the result moves.
Use it when your results swing without an obvious cause. Start with dough temperature, because it is the largest contributor and the easiest to control once you measure it. Then write down enough to compare two bakes, and change one variable at a time.
Next step: measure and record the temperature of your dough at the end of mixing on your next three bakes. If that number is moving, you have found the main source of your inconsistency and the fix is straightforward.
Where to go next
- Read the full guide: the four numbers that decide your pizza crust
- The biggest variable: desired dough temperature
- The second biggest: fermentation is time and temperature
- The record that makes diagnosis possible: how to log a bake
- If a specific defect is the problem: diagnose your bake by symptom