> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agrihub360.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Read Where a Decision Comes From

> Each line on Today shows where it came from: the regulation, the model, or the device.

<Steps>
  <Step title="Find the line under the sentence">
    Under each decision, in small type next to an information mark, is where it came from. A closed period names the regulation, a window names the model and its inputs, and a reading names the device.
  </Step>

  <Step title="Tap the source">
    The regulation opens on gov.uk. A model opens its card on the field with the inputs it used. A device opens its page with the last reading.
  </Step>

  <Step title="Check measured or modelled">
    A number worked out by the app says **modelled** and names the model. A number read by a device says **measured** and names the device and the time.
  </Step>
</Steps>

<Frame caption="The source under each decision: a regulation, a forecast and a model, or a trigger.">
  <img src="https://mintcdn.com/agrihub360/U-w2pyncLxF4g_f2/images/screens/today.jpg?fit=max&auto=format&n=U-w2pyncLxF4g_f2&q=85&s=8493d41bfe0c46b085fbb6a240171653" alt="Today: under each decision a small line such as 'Forecast, Open-Meteo, Delta-T and wind' or 'Nitrate Pollution Prevention Regulations 2015'." width="270" data-path="images/screens/today.jpg" />
</Frame>

## What You See Next

Every line on Today can be traced back this way. If a line says modelled and you would rather have it measured, [Is a Probe Worth It Here](/how-do-i/sensors/is-a-probe-worth-it-here) tells you whether a sensor would change the number.

## If It Does Not

| You see                               | It means                                 | Do                                             |
| ------------------------------------- | ---------------------------------------- | ---------------------------------------------- |
| The source says "nation not stated"   | The nation is missing                    | More, Settings, the farm, then the nation      |
| The model names a field with no probe | The reading is modelled from public data | That is the honest answer; a probe replaces it |

Related: [See the Week's Decisions](/how-do-i/today/see-the-weeks-decisions), [Measured Against Modelled](/features/field-monitoring/measured-against-modelled).