Top-down model
In the top-down model, the main corporate organization adds each department's organization as a member.
Note
It is permissible for one person to be a member of multiple department organizations. If those organizations provide different levels of access to the corporate organization, the individual will be granted the higher level of access.
Key features
Membership to the main corporate organization can be granted to individuals directly or through their membership in department orgs
Different departments can be granted different levels of access over resources owned by the main corporate org(e.g everyone in a 'Governance' org can be given Admin access to the corporate org)
Resources owned at the department level must be explicitly shared company wide - there's greater control over which other departments can see them
Removing members from the corporate organization does not revoke access to department organizations
Limitations
When the main corporate organization has multiple Collections, administrators have control over all Collections
