The collaboration offers support for Geant4, providing

A user can also expect assistance in

Users of the software who encounter a problem in running the code can use an

The system is open to all users. It is set up automatically to assign problem reports to the responsible person according to the category affected. The contact person may then respond directly or forward it to a colleague. This system is a customized version of the open source reporting tool Bugzilla . Besides routing the problem to specialists, it tracks and documents the responses until the problem is resolved.

New requirements, such as requests for new functionality, are presented to and decided by the Steering Board (SB). The SB sets the priorities and agrees on time-scales for the fulfillment of new requirements. Such support is guaranteed to collaboration members, while requests from non-members are handled on a best effort basis.

For each member organisation a contact person (SB member) has been designated who acts as a first reference for Geant4 users in that locality, which may include affiliated institutions, user groups, and others in the same geographic area. The contact person will respond to enquiries, help resolve simple problems, and forward more specialized queries to the relevant expert(s).

Beyond that, a list of frequently asked questions (FAQs) , and an internet-based user forum complete the available Geant4 user support.