# Membership in Communication

Local use of the Membership mirror: recipients and rule audiences.

[Shared definition and source fields](/systems/core/membership).

A membership is the usual recipient of a work message. The Daily Digest finds the recipient here by the shared Membership # and links it in Message → Recipients (Membership). Membership # is the cross-base key; local record ids differ in every base. Member, Business Unit, Reports To, Heads and Teams are source links that point to other mirrors here.

## Local usage

| Field | Storage | Current configuration |
| --- | --- | --- |
| Notification Rules (Audience) | Linked records | [Notification Rule](/systems/communication/entity-notification-rule); rules that tell this membership |
| Messages (Recipient) | Linked records | [Message](/systems/communication/entity-message); messages delivered to this membership |
| Tags | Linked records | [Tags (mirror)](/systems/communication/entity-tags); optional labels |

## Maintenance

Correct shared facts in Core and local links in Communication. The table description declares a read-only, one-way copy. Check the sync source view, field mapping and refresh interval in the Airtable sync settings before relying on them.

[Domain boundaries](/systems/communication/architecture) · [All entities](/systems/communication/entities)