Caroline Terwee is associate professor of Measurement at the Department of Epidemiology and Biostatistics of the Amsterdam UMC, Vrije Universiteit Amsterdam, where she is head of the research group “Measurement”. Her research focusses on methodology for the selection and standardization of outcome measures, for example through systematic reviews of outcome measures, Core Outcome Set development, and the validation and implementation of IRT-based item banks. She is founder of the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN) initiative, an international group who aims to improve the selection of outcome measurement instruments in research and in clinical practice by developing methodology and practical tools for instrument selection. She is current president of the PROMIS Health Organization and coordinator of the Dutch- Flemish PROMIS group who aim to improve health outcomes by developing, maintaining, improving and encouraging the application of PROMIS in research and clinical practice.