The 2025 WLCG/HSF Workshop [https://indico.cern.ch/event/1484669/] took place last week in Orsay, France. There were sessions on AI/ML, facility evolution, the token migration plan, analysis challenges, operations, DOMA, and many others. During the token migration session, a proposed roadmap for the token transition was presented and discussed, including a Token Grand Challenge in Q4 of 2026 in anticipation of DC27 which will include token-based authorization for jobs as well as storage.

At the Workshop there was an open meeting of the WLCG Technical Coordination Board (TCB#4) on Wednesday afternoon [https://indico.cern.ch/event/1484669/timetable/#b-614773-wlcg-open-technical-c] where we had a presentation on combining the computing resource requirements from all four LHC experiments (as best they are known publicly at this time) and a second presentation on the flat-budget capacity evolution bands. For the latter topic in particular there was general consensus that the 20% line (the upper limit of the gray bands in HL-LHC resource projection plots, e.g.) was unrealistic and that the experiments and the WLCG should discuss agreeing on a new flat-budget envelope such as one centered on 10% year-over-year with upper and lower limits at 15% and 5%, respectively. Using a common set of assumptions for resource projection plots was a recommendation of the LHCC since the 2021 round of computing model reviews.

The topical outline of the Technical Roadmap was then discussed and critiqued, with many helpful comments. After taking these comments into account, the outline [1] and accompanying slides [2] were circulated to the WLCG MB for comment at today’s meeting and eventual review by the WLCG LHCC Referees during LHCC Week [https://indico.cern.ch/event/1525772/] on June 3rd. Please send any additional comments to us by the end of this week. The slides and document are due to be submitted to the LHCC Referees by Tuesday, May 27th.

[1] https://docs.google.com/document/d/1NGtjJY_SRa8HZ01DABWwO_sZ7jE10E0NpdA1OXbeVlw/edit?tab=t.0#heading=h.12huz52bz7y

[2] https://docs.google.com/presentation/d/18CFLezOHSKIooqP37EIQ8Ty8x-p2qltudSaepYsFQyo/edit?usp=sharing