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Document status:  Public Draft



This page presents basic introductory information about the UW Groups Service that will help you use it, whether you are accessing it with a web browser or via a programmable client using the service's REST interface.The UW Groups service provides infrastructure for defining, maintaining, and using "groups", defined simply as named objects, each with a membership list and a standard set of attributes known collectively as "metadata". Members might consist of people, computers, or other kinds of principals, even other groups. to give context for use through its browser interface ( and via the Groups Service API.

Similar information is available in the UW Groups article in IT Connect.



The UW groups service is a central location in which groups can be created, managed, and then reused in other services and applications. Groups can be created from various sources of group information and used in a wide variety of integrated services and applications, as illustrated in Figure 1.

Image Added

Some groups are managed by individual people and teams to meet specific needsfor ad hoc purposes such as collaboration, communication, or access control. Other groups are created and maintained by organizational managed by UW organizations or institutional processes , such as UW course enrollments , to serve more general needs. Reuse and delegated management authority are guiding principles. As such, the service is available to all UW employees, students, organizations, and their designated partners.

The UW Groups Service is provided for the use of the University of Washington community, including users and organizations of all kinds.  The service is a central location in which groups can be created and managed.  Groups information can be imported from other systems, and may be used in a wide variety of services and applications.

Group IDs and home groups

The Groups Service uses a structured space or UW employee appointments.

This diversity of group information sources and varied application uses is enabled by a delegated model of management authority: any member of the UW community can use the service to manage groups under his/her authority and delegate that authority to others as needed. Individuals can do this by themselves or as part of a team or organization.

You can access the web browser interface by logging in using your personal UW NetID. Access using shared UW NetIDs (also known as supplemental accounts) is not supported. However, you can use your shared UW NetID to name and identify groups.

Programmatic access to the REST API requires client authentication using a X.509 certificate issued by the UW Services CA. Once authenticated, applications can create, read, update, and delete groups for which they are authorized to do so.

Groups may be classified according to UW Administrative Policy Statement 2.6 (Information Security Controls and Operational Practices). All groups are assigned "unclassified" status until an administrator has intentionally applied a "Public", "Restricted", or "Confidential" classification.

Groups Usage

Groups are well suited to applications involving lists of identifiers for people (or other entities), where the application needs to know whether someone is a member of a group or needs to obtain the entire membership of the group.

Common uses of groups in applications include email, collaboration, calendaring, access control, purchasing, sharing, voting, scheduling, federating, surveying, and polling.

Purpose / Usage



Communicating via email with a group


Communicating and sharing resources among a group


Scheduling events and/or sharing calendars with a group

Access Control

Managing and reviewing access to resources based on a group


Providing software and other resources for purchase to an eligible group


Distributing resources to a group


Putting choices to a vote by a group


See Calendaring


Asserting group membership to 3rd party applications via federation


Conducting surveys with a group


See Surveying

UW Group IDs

The UW groups service uses a structured namespace for group identifiers, known as UW Group IDs, permitting UW people and organizations to create and manage groups independently, much like a multi-user computer filesystem.  For each person or organization there is a home group on which new group IDs can be based.

For persons the home group is based on your personal UW NetID.  For example, if your personal UW NetID is "bob234", your home group is "u_bob234".  You can create groups based on this group ID, for example "u_bob234_friends".  Your home group is created the first time you sign on to the Groups Service, so you are all set to create and manage personal groups.

If your UW organization (school, department, etc.) has its own UW Domain Name System namespace under "" you can use that same name for group IDs.  For example, if an organization manages domain names under "", it can have a home group of "uw_org789".  To have a home group created for your organization using this space, send email to

Many UW organizations also use supplemental accounts (also known as shared UW NetIDs) to hold organizational resources such as web sites or email contacts.  These accounts can also be used as a basis for groups, and have their own home groups.  For example, a supplemental account "dept456" would have the home group "u_dept456".  To have a home group created for a supplemental UW NetID, send email to  Each group has a unique UW Group ID.  Systems and applications using UW Groups typically refer to groups using UW Group IDs.

UW Group IDs consist of lower-case letters (a-z), digits (0-9), dash ("-"), dot (".") and underscore ("_").   The underscore character is used to separate components of namesgroup IDs, much like slash ("/") or backslash ("\") is used in URLs or filenames or URLs.

For a complete description of UW Group IDs, see the UW Group Naming Plan .


Groups may have members of several types:

. Refere to the UW Groups Naming Plan for more information.

If you want to create a new group, you can do so if you have appropriate permission (see Access Controls below) on an existing group.  You can see what groups you administer using the "My groups" tab (instructors also see their courses via My groups).  For example, if you have Admin or Create access to the "uw_pavesci_admin" group, you could create a group called "uw_pavesci_admin_fulltime".  You should choose a UW Group ID appropriate for the expected use of the group, bearing in mind that the group may be used by many people for a long time.

If you need to create a new namespace for UW Group IDs in the UW groups service for your organization, refer to the Home Groups page to learn more.

Group Memberships

In the UW groups service, individual groups may include members using several types of identifiers:

Identifier Type





Any type of UW NetID may be used as a group member

Federated ID

An ID from some non-UW sourceidentity service provider, in user@domain format

DNS name

Any DNS name, typically used for subject names in UW CA-issued X.509 certificates

UW Group ID


Any other Other UW Group ID

Direct members are those members that are listed in a group's entry.  Effective members include all direct members, plus members of any groups listed as members, recursively.


IDs can be members of groups.

UWWI Computer


The netbios name of a computer joined to UWWI followed by a "$" character

When adding members, the groups service verifies that member entries are valid; for example it does not check to see whether an entered UW NetID really exists, except for federated ID values; to add a UW Group ID as a member, you must have permission to view the membership of the member group.

Some systems and applications using the Groups Service service may be limited in the membership types of members they can handle.  For example, the use of federated IDs for access control wouldn't apply in an application that only accepts logins by UW NetIDs for signon.

Access control

End-user access to the Groups Service is available to all those with personal UW NetIDs. Signon using supplemental (aka shared) UW NetIDs is not permitted. Programmatic access is available using any certificate issued by the UW Services CA.

The Groups Service NetID.

When viewing group memberships, "direct" members are those members that are listed in a group's membership, directly; while "effective" members include all direct members, plus members of any groups listed as members, recursively.

Administrators, subgroup creators, and member managers are not automatically added as group members.

Members can join and leave group memberships on their own if they're permitted to do so by the group administrators use of the opt-in and opt-out permissions.

Viewing the memberships of groups classified "Confidential" requires a valid 2-factor login session.

Access Controls

The UW groups service provides controls to manage who can create, update, and delete group information. (Controls to manage who can view group information are planned for later releases.) Groups All groups have these controls:


Role Name



permits any operation Administrator

Permits all operations on the group, including deletionupdate, creation, and update


permits groups to be created with Group IDs based on delete, create subgroup, manage members, and view members


Subgroup creator

Permits new subgroup creation; i.e. new UW Group IDs using this group's ID as the prefix

Update permits

Member manager

Permits adding and removing members of the group

Member View

Membership viewer

Permits restricting who can view a group's membership, including no restrictions


Opt-in population

Permits individuals to join a group membership on their own


Opt-out population

Permits individuals to leave a group membership on their own

Access control entries can have any of the types of identifiers that group memberships can have (: UW NetID, UW Group ID, federated ID, cert/ DNS name), or UWWI computer.

When a personal home group is created, the UW NetID on which it is based is given Admin control on the group.  When a home group based on a supplemental UW NetID or organization DNS name is created, An organizational home group has an initial set of users is given with Admin control, as requested by the organization.  In any case these You have Admin access to your personal home group when it is created.  These controls can be modified after creation to give at any time so you can control access as needed.When a regular (i.e., non-home) group is created it inherits controls from the group on whose group ID it is based

The creator of a group is automatically added as an Admin of the group. In those cases where this isn't desirable, return to the Edit page after group creation and remove the entry. Make sure that at least one other person or group is listed as an administrator.

Changing access controls on a group affects only that group. It has no effect on controls in any other existing groups.

Enhanced Security

Each group has an security attribute that controls whether or not a valid 2-factor login session is required to administer the group. This attribute is located under the administrators control, enabled via an "enable enhanced security" checkbox.

Any administrator of a group can enable enhanced security, but doing requires a valid 2-factor login session.

With enhanced security enabled, editing group information, deleting, moving/renaming, and changing membership requires a valid 2-factor session, except for groups with opt-in/opt-out enabled, in which case users can join/leave without doing 2-factor authentication.

Since application clients currently have no way to perform strong (higher-assurance) authentication, programmatic clients of the GWS REST API cannot update/delete groups with enhanced security enabled. For the same reason, the enhanced security attribute itself cannot be enabled or disabled via the GWS REST API, although it will be present in representations retrieved via the REST API.

Further Reading

Now that you're familiar with the basics of the service, you may want to browse the user interface by signing in to using your personal UW NetID.

For further reading on some of topics mentioned above refer to these pages:

Home Groups
UW Group Naming Plan
Groups Service Architecture
Institutional Groups