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This report summarises progress and results of the CLIC studies at the time of submitting input to the update of the European Strategy for Particle Physics, in December 2018. The report describes recent achievements in accelerator design, technology development, system tests and beam tests. ; Published by the corresponding editors on behalf of the CLIC and CLICdp collaborations: This work benefited from services provided by the ILC Virtual Organisation, supported by the national resource providers of the EGI Federation. This research was done using resources provided by the Open Science Grid, which is supported by the National Science Foundation and the U.S. Department of Energy's Office of Science. This work was supported by the European Union's Horizon 2020 Research and Innovation programme under Grant Agreement No. 654168 (AIDA-2020); the European Union's Horizon 2020 Research and Innovation programme under Grant Agreement No. 777431 (CompactLight); the European Union's Horizon 2020 Marie Sklodowska-Curie Research and Innovation Staff Exchange programme under Grant Agreement No. 645479 (E-JADE); the National Commission for Scientific and Technological Research (CONICYT), Chile; the DFG cluster of excellence "Origin and Structure of the Universe", Germany; the Federal Ministry of Education and Research (BMBF), Germany under Grant Agreement No. 05H18VKRD1; the Israel Science Foundation (ISF); the I-CORE Program, Israel; the Israel Academy of Sciences; the Programma per Giovani Ricercatori "Rita Levi Montalcini" of the Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR), Italy; the Research Council of Norway; the National Science Centre, Poland, HARMONIA project under contract UMO-2015/18/M/ST2/00518 and OPUS project under contract UMO-2017/25/B/ST2/00496; the Polish Ministry of Science and Higher Education under contract No. 3501/H2020/2016/2 and 3812/H2020/2017/2; the Ministry of Education, Science and Technological Development of the Republic of Serbia under contract No. OI171012; the Spanish ...

A large, world-wide community of physicists is working to realise an exceptional physics program of energy-frontier, electron-positron collisions with the International Linear Collider (ILC). This program will begin with a central focus on high-precision and model-independent measurements of the Higgs boson couplings. This method of searching for new physics beyond the Standard Model is orthogonal to and complements the LHC physics program. The ILC at 250 GeV will also search for direct new physics in exotic Higgs decays and in pair-production of weakly interacting particles. Polarised electron and positron beams add unique opportunities to the physics reach. The ILC can be upgraded to higher energy, enabling precision studies of the top quark and measurement of the top Yukawa coupling and the Higgs self-coupling. The key accelerator technology, superconducting radio-frequency cavities, has matured. Optimised collider and detector designs, and associated physics analyses, were presented in the ILC Technical Design Report, signed by 2400 scientists. There is a strong interest in Japan to host this international effort. A detailed review of the many aspects of the project is nearing a conclusion in Japan. Now the Japanese government is preparing for a decision on the next phase of international negotiations, that could lead to a project start within a few years. The potential timeline of the ILC project includes an initial phase of about 4 years to obtain international agreements, complete engineering design and prepare construction, and form the requisite international collaboration, followed by a construction phase of 9 years.