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

# Masking

A study design where certain people involved in the trial don't know which participants are receiving which treatments, using open label, single-blind, or double-blind approaches.

## Related terms

<CardGroup cols={3}>
  <Card title="Phase" href="phase" />
</CardGroup>

[*Source*](https://clinicaltrials.gov/study-basics/glossary)