Groups And Roles

How groups and roles work

Groups and roles both simplify access control by moving permission assignment away from individual users. A group typically represents a set of people who need the same access to the same resources, while a role represents a job function or operational responsibility, with permissions attached to the role rather than the person.

This distinction matters because groups are usually better for shared membership-based access, while roles are better for expressing what a job is allowed to do. In mature environments, the two are often combined so that role assignment is governed centrally and group membership is used to implement the resulting access efficiently.

Why access control systems use both

Access control systems use groups and roles because direct user-to-permission assignment does not scale. When access is bundled, administrators can grant or remove permissions in a smaller number of places, which reduces inconsistency and makes reviews more manageable. This also supports standard lifecycle processes such as joiner-mover-leaver changes, where access should follow the person’s current function rather than their historical assignments.

Roles are especially useful when the organisation wants a business-facing model of access, such as finance approver, help desk operator, or platform administrator. Groups are often the lower-level enforcement mechanism behind that model, especially in directories, collaboration platforms, and enterprise applications that apply permissions through group membership.

In practice, the best design is usually one that keeps the business meaning of the role clear while limiting the number of groups needed to enforce it. That helps avoid access sprawl and makes it easier to understand why a user has a permission.

Groups, roles, and RBAC

Groups and roles are closely associated with role-based access control, where permissions are granted to roles and users receive access by being assigned to those roles. Some systems blur the distinction and use groups as roles, or roles as groups, but the important point is the access model, not the label.

RBAC works well when permissions map cleanly to job functions and when the same access is needed by many users. It becomes less clean when exceptions accumulate, because ad hoc additions can turn a simple model into a hidden permission maze. That is why many organisations try to keep role design narrow, reviewable, and tied to an explicit owner.

Where the platform supports it, role hierarchy, scoped administration, and administrative units can make the model more precise. Where it does not, the organisation may still use groups as the practical control layer, but it should treat naming and ownership as part of the access design, not just directory hygiene.

Governance, reviews, and lifecycle control

Groups and roles are only effective when someone owns them and regularly checks whether they still reflect real work. Joiner-mover-leaver workflows should update or remove access when people change teams, move roles, or leave the organisation. Access reviews should also validate that membership still matches current business need and that privileged roles have not become overbroad.

This is where poor governance becomes visible. A group with no clear owner, a role nobody can explain, or a long list of exceptions usually means the access model has drifted away from the actual organisation structure. Good governance keeps the model legible enough that reviewers can tell whether a permission is justified.

For identities that hold elevated access, the distinction between a role that authorises activity and the group that implements it should be especially well understood. The more privilege a role conveys, the more important it becomes to know who approved it, why it exists, and when it should be removed.

Common design and administration pitfalls

The biggest mistake is treating groups and roles as interchangeable labels without a consistent policy. That often leads to duplicate objects, hidden inheritance, inherited access that nobody revisits, and access granted for convenience rather than business need. Another common issue is using one large group to solve too many access problems, which makes revocation and review difficult.

Another pitfall is letting permissions accumulate around people instead of functions. When a user moves jobs, their old access should not remain by default. If that happens often, the access model is no longer role-driven in practice, even if the directory structure still uses role names.

Well-run environments keep the model simple enough to explain and specific enough to audit. The goal is not just to grant access efficiently, but to make it easy to prove why access exists and whether it still should.

Related resources from NHI Mgmt Group

• What breaks when access reviews are not coordinated across infrastructure, identity groups, and SaaS roles?
• How should security teams balance ACLs, roles, groups, and attribute rules in modern access control design?
• What breaks when organisations cannot see how access is granted through roles, groups, and trust relationships?
• How should security teams determine access privileges in Azure AD before assigning users to roles and groups?