Review group (RG) – serves as an advisory group to assess changes/documents before the subsequently processed documents are submitted to the Supervision Group through the working group. At the same time, it serves as a "source" of primary ideas for changes in the implementation of the project and also as a "source" for recruiting other members to the wider working group.

The RG is an integral part of the entire HRS4R implementation process and can be understood as a wider working group. The RG consists of researchers R1 to R4 and representatives of the medical staff (an indispensable part of the staff at NIMH).