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

# Studies Overview

> A study bundles eligibility criteria, geography, and enrollment goals. Learn how to design, launch, and manage recruitment.

A study is the container that powers your recruitment campaign. It bundles who you need (eligibility criteria), where you need them (geography), and how you're billed and capped (pricing and lead limits) into a matching engine that surfaces volunteers for your study.

## Anatomy of a study

<CardGroup cols={2}>
  <Card title="Eligibility Parameters" icon="list-checks" href="/studies/eligibility-parameters">
    Define inclusion and exclusion criteria from conditions, medications, and other structured rules.
  </Card>

  <Card title="Geographic Scope" icon="map-pin" href="/studies/geographic-scope">
    Set where volunteers must reside, from a ZIP radius up to statewide or nationwide coverage.
  </Card>

  <Card title="Enrollment Goals" icon="target" href="/studies/enrollment-goals">
    Track progress toward a target, and set the study-level caps that control study availability.
  </Card>

  <Card title="Study Formats" icon="layout-template" href="/studies/study-formats">
    Choose site-based, virtual, or hybrid delivery. Make sure site information is set up for site-based or hybrid delivery.
  </Card>
</CardGroup>

## Study lifecycle

A study moves through a fixed set of statuses:

<Steps>
  <Step title="Draft">
    Create a new study and configure it. At this stage it stays invisible to volunteers and fields are freely editable. You may edit a study at any point.
  </Step>

  <Step title="Active">
    Once launched, volunteer matching against your criteria begins. Some fields (name, study type, delivery model, phase, and protocol number) lock permanently and cannot be changed.
  </Step>

  <Step title="Paused">
    Pause recruitment at any time. A paused study can be resumed back to active or marked as completed or ended.
  </Step>

  <Step title="Ended or Completed">
    After a study is marked as completed or ended, no changes can be made.
  </Step>
</Steps>

## Next steps

* [Configure eligibility parameters](/studies/eligibility-parameters)
* [Set geographic scope](/studies/geographic-scope)
* [Understand enrollment goals and lead limits](/studies/enrollment-goals)
* [Choose a study format](/studies/study-formats)