# Account and access management

Trials are private to the people who need them. This chapter covers who can see a trial
and how to share it.

## Roles recap

Owner
: Full control of the trial, including launch, deletion, ownership transfer, and
  managing who else has access. One per trial.

Collaborator
: Can view and edit the trial's configuration, but cannot launch it, delete it, transfer
  ownership, or manage membership.

Auditor
: Read-only access to the trial and its monitoring.

Administrator
: Platform-wide access to every trial, for the people running the platform.

## Sharing a trial

The owner can add colleagues as **collaborators** so they can help configure the trial.
Collaborators see the trial in their own trials hub. Removing a collaborator revokes
their access.

## Transferring ownership

The owner can hand a trial to another researcher. After transfer, the new person is the
owner (with full control) and the previous owner keeps access only if they are added as
a collaborator. Ownership is a single pointer, there is always exactly one owner.

## Visibility

- You see the trials you own, plus any shared with you as a collaborator or auditor.
- Administrators see every trial.

If you cannot see a trial you expect to, ask its owner to add you, or an administrator to
check its ownership.