A group is a named set of members that can be assigned as an RFC’s reviewers or approvers.
The Groups tab in Settings, showing role groups and their members
Find it at Settings → Groups.

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Why groups rather than people

Assigning an RFC to a named individual works until that individual is on leave, changes team, or leaves the company — at which point every document they were named on is stranded, and the audit trail shows a review step that never completed. Groups solve that. Assign to API Reviewers, change who is in it over time, and the assignment on every RFC stays valid.

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Managing groups

1

Create

Name the group after the responsibility, not the people — “Security Approvers”, not “Sam and Priya”.
2

Add members

Pick from the organisation’s members. Membership changes are recorded in the audit trail as role_group.member_added and role_group.member_removed.
3

Rename

Groups can be renamed without breaking existing RFC assignments — the assignment follows the group, not its label.

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Assigning a group to an RFC

The domain owner sets the reviewer and approver groups on the RFC page. See Review and approval.
Group membership grants responsibility, not capability. A member still needs the approver role to approve anything — see Members and roles. Being in an approver group without the approver role does nothing.
The domain owner may always approve RFCs in their own domain regardless of which group is assigned.

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Designing your groups

Three or four people who genuinely work in the domain. A group of twelve is a group where everyone assumes someone else is reviewing.
Reviewing is a technical read; approving is an accountability decision. Using the same group for both collapses the two-person check that makes the audit trail meaningful.
A group per architecture domain is the pattern that scales — the people who should review API standards are rarely the ones who should review incident response.
Stale groups are the quiet failure mode: an RFC sits at proposed for a fortnight because everyone assigned to review it changed teams in March.