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

# Build and review a sequence

A Sequence is where the Run becomes launch-ready. You choose enriched lead sources, attach a strategy profile, generate message previews, review readiness, and approve the messages that can send.

## Build the sequence

* Go to the Run's **Sequences** page.
* Click **Create sequence**.
* Name the sequence.
* Select the strategy profile.
* Choose the eligible source groups that should enter the sequence.
* Create the sequence and open the Messaging Lab.

<Frame>
  <img src="https://mintcdn.com/plera/5ayeyzcobob3uDIg/images/get-started/build-the-sequence.png?fit=max&auto=format&n=5ayeyzcobob3uDIg&q=85&s=96bf9cde2f5cb5f5ce3b6f317a87ba41" alt="Sequence builder" width="1990" height="1468" data-path="images/get-started/build-the-sequence.png" />
</Frame>

## Review before launch

* Generate previews before approving messages.
* Check lead fit, message accuracy, channel coverage, and sender readiness.
* Resolve launch blockers shown in the readiness panel.
* Approve the messages that are ready to send.

<Frame>
  <img src="https://mintcdn.com/plera/5ayeyzcobob3uDIg/images/get-started/review-before-launch.png?fit=max&auto=format&n=5ayeyzcobob3uDIg&q=85&s=a84b4fcf9e3a3839e779a09dc300ddf3" alt="Messaging Lab review before launch" width="1994" height="1472" data-path="images/get-started/review-before-launch.png" />
</Frame>

## Before you continue

You are ready to launch when the readiness panel is clear, required messages are approved, and the selected sending accounts match the sequence channels.