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

# Conditions

> Show or hide blocks based on earlier answers.

A **condition** controls whether a block is shown to a participant, based on what they answered earlier. Use conditions for **screening**, **branching**, and **routing** within a single study version.

## How it works

1. Select the block you want to make conditional.
2. In its Configure panel, add a **visibility rule**: "show this block if \[earlier answer] \[operator] \[value]".
3. At run time the rule is evaluated **live** — participants only see blocks whose conditions pass.

## Common patterns

* **Screening**: route out participants who don't meet criteria (e.g. send them to the end if a screener answer disqualifies them).
* **Branching**: show follow-up questions only to people who answered a certain way.
* **Skip logic**: hide a whole section that doesn't apply.

## On the whiteboard

Switch the Builder to **Whiteboard** mode to see your study as a graph — blocks are nodes and conditions are the edges between them. You can draw a condition by connecting one block's answer to another block.

<Note>
  Conditions branch **within one version**. To split participants across **separate arms** of a study (e.g. stimulus A vs B), use [variants](/builder/variants) instead.
</Note>