# Structural organizations

In Tonic Structural, each user belongs to an organization. Organizations are used to determine the company or customer that a Structural user belongs to. The **User Settings** view displays the organization identifier for the user.

A self-hosted instance of Structural contains a single organization. All users belong to that organization.

Structural Cloud hosts multiple organizations. The organizations are kept completely separate. Users from one Structural Cloud organization do not have any access to the users or workspaces that belong to a different Structural Cloud organization.

## When is a Structural organization created?

A Structural organization is created:

* For a standard Structural license, both self-hosted and Structural Cloud, when the first user signs up for a Structural account.
* When a user signs up for a free trial on Structural Cloud. Each free trial user is in a separate Structural Cloud organization.

Each organization should have at least one user that has administrator privileges.

* On Structural Cloud, the first user in the organization is granted the [Account Admin permission set](https://docs.tonic.ai/app/admin/tonic-user-access/permissions/granting-account-admin-access-for-a-structural-cloud-organization).
* Self-hosted instances [use an environment setting to identify the initial administrator accounts](https://docs.tonic.ai/app/admin/tonic-user-access/permissions/managing-admin-users).

## When is a new user added to an existing organization?

### **Self-hosted instance**

A self-hosted instance has a single organization. Every user who signs up for an account on that instance is added to the organization.

### **Annual Structural Cloud license**

For companies with an annual Structural Cloud license, the license includes the email domains that are included in the license.

When a user with one of the included email domains signs up for a Structural account, they are automatically added to that organization.

### **Free trial**

During a free trial, a user can invite users with the same corporate email domain to have access to their free trial workspace.

When those users sign up for a Structural free trial in response to that invitation, they are automatically added to the Structural Cloud organization for the free trial user.


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