# Assumptions
URL: https://docs.valsight.ai/assumptions/
Description: Assumptions represent explicit views on how the future might develop. They capture planned or discussed changes and apply them consistently across the model …
Assumptions represent **explicit views on how the future might develop**. They capture planned or discussed changes and apply them consistently across the model to explore alternative outcomes.

## Why are they relevant

* For planning or discussing possible future developments
* When a change affects multiple values or drivers at once
* To group related changes into one coherent idea
* To comparing the impact of different measures or viewpoints

## How it works

An assumption describes an **encapsulated change on top of the base data**.

Each assumption:

* Represents one idea or measure (e.g. market growth, cost increase, hiring plan)
* Groups all related changes that belong to that idea
* Can affect multiple line items and years at once
* Exists independently from other assumptions

Assumptions make it easy to understand *what changed* and *why*, without having to inspect individual calculations.

![Scenario Manager\_Assumptions.png](./images/6663438366.png)

## Setup

Assumptions are created and managed in the Scenario Manager.

Once created, they can be reused, combined, or reordered to match planning discussions and priorities.

## Using the feature

* Use assumptions to evaluate alternative developments or planned measures.
* Group related changes into a single assumption instead of spreading them across the Scenario Manager.
* Review an assumption’s impact at a glance with just one click.

## Access & permissions

Assumptions follow workspace and scenario permissions.
Users with access to the Scenario Manager can create and edit assumptions.

## FAQ

**What is an assumption in planning terms?**

An assumption is a stated view or estimate of how the future might develop.

**Can one assumption affect multiple values?**

Yes. An assumption typically groups several related changes.

**Are assumptions tied to a single scenario?**

Assumptions can be reused and combined across scenarios.

**Do assumptions replace base data?**

No. They apply changes on top of the base data.

## Related documentation

* [Working with different Model Baselines](/working-with-different-model-baselines/)
* [Line-items](/line-items/)