The Phase-II Upgrade Groups (P2UG) monitor the execution of the Phase II upgrade projects, verifying the technical progress, tracking the milestones, and ensuring the level of effort and managerial organization are adequate. Their mandate and composition can be found here (url).
Chairpersons:
ATLAS: Dave Newbold (University of Bristol, UK) until end May 2023 - Steve Nahn (Fermilab, US) from June 2023
CMS: Marcel Demarteau (Oak Ridge National Laboratory, US)