# What is Maker-checker?

> Maker-checker is a control in which the person who makes a change cannot be the person who approves it. Applied to Salesforce, it means every production change is reviewed and approved by a second person before it deploys.

Source: https://synconai360.com/glossary/maker-checker

Also called: four-eyes principle, two-person approval.

## Why it matters

It catches mistakes the author cannot see and gives auditors a clear separation of duties. Many compliance frameworks expect it for production systems.

## In SyncOnAI 360

In SyncOnAI 360, production needs an approved proposal, and in a workspace with two or more admins the approver must be someone other than the author. A single-admin workspace can approve its own change, and the activity log records that it did.

## Related terms

- [Change freeze window](https://synconai360.com/glossary/freeze-window)
- [Deploy receipt](https://synconai360.com/glossary/deploy-receipt)
- [Pre-flight check](https://synconai360.com/glossary/pre-flight-check)