Question 1: Main collider project

1. Which is the preferred next major/flagship collider project for CERN?

2. What are the most important elements in the response to (1)?

• Physics Potential

• Long-term perspective

• Financial and human resources: requirements and effect on other projects

• Timing

• Careers and training

• Sustainability

1. Should CERN/Europe proceed with the preferred option set out in (1) or should alternative options be considered

• if Japan proceeds with the ILC in a timely way?

• if China proceeds with the CEPC on the announced timescale?

• if the US proceeds with a muon collider?

• if there are major new (unexpected) results from the HL-LHC or other HEP experiments?