# Introduction to Assumptions

## Overview

In [**Models**](/models/home-tab.md), input values are stored separately from [**Variables**](/variables/variable-basics.md) and their [**Calculations**](/calculations/introduction-to-calculations.md).

This allows you to manage the inputs to your Model independently of the calculations within the Model, and to easily create variations on your inputs (through [**Scenarios**](/cases/managing-scenarios.md) and [**Sensitivities**](/cases/managing-sensitivities.md)).

This separation means that you can create sets of Assumptions from scratch, without creating the Variables that will reference them, though in practice you will most often generate Assumptions from within a Variable as this is by far the fastest way to do so.

<figure><img src="/files/gZO0SqLImgon4JaqNQTi" alt=""><figcaption><p>List of Assumptions in Models</p></figcaption></figure>

## The Assumptions Tab

<figure><img src="/files/1PJYuRRF1EYNklMPtFBa" alt="Screenshot of the Assumptions tab, with several assumptions selected, showing a preview chart of the values of those assumptions"><figcaption><p>Assumptions List in the Assumptions Tab</p></figcaption></figure>

Keeping Assumptions separate from Variables means you can thoroughly interrogate and quickly edit all inputs to your Model in one place.

You can do this in the Assumptions Tab, where functionality includes (as per the above screenshot):

* Search and Order your Assumptions with Tag filters, text search, property filters and sorting <mark style="color:green;">**(1)**</mark>
* Directly edit Assumption [**Scenario**](/cases/managing-scenarios.md) values <mark style="color:green;">**(2)**</mark> - just click in a cell, type, and press Enter to save
* Directly edit Assumption [**Sensitivity**](/cases/managing-sensitivities.md) values <mark style="color:green;">**(3)**</mark>
* Visualise your assumptions in [**Charts**](/charts/introduction-to-charts.md) - just select any Assumptions that relate to each other, and Models will plot them on a chart which you can configure.

{% hint style="info" %}
Selecting a single Assumption will show you a preview including the details of that Assumptions Unit; Selecting multiple Assumptions will show you a chart (if the selected Assumptions' Units can form a valid series)
{% endhint %}


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