This presentation will describe a large international project which aims to develop the metrological infrastructure for the determination of ultrasound exposure and dose to tissue. Ultimately this will improve treatment planning and risk assessment. The 3-year project started in June 2012. It is co-ordinated by the UK National Physical Laboratory and is funded in part by the European Metrology Research Programme of the European Union. The other project partners are INRIM (IT), PTB (DE), UME (TR), CSIC (ES), ICR (UK), Moscow State University (RU), NIM (CN), and University of Merseburg (DE). The scientific work is divided into six Work Packages: —Quantities and definitions will review dose and in situ exposure quantities proposing alternatives where necessary; —Laboratory dosimetry standards will develop reference methods for thermal and non-thermal therapeutic dose parameters; —Dose modeling and validation will develop theoretical and computer modelling procedures to calculate acoustic and thermal dose quantities with well understood uncertainties; —Intercomparison of methods will formally compare measurement methods and models developed; —Dosimetry Transfer Standards will develop phantoms and test systems for the assessment of clinical ultrasound equipment, transferring laboratory standards to end-users; —Application to clinical treatment will provide a direct link between the methods developed and the clinical use of therapeutic ultrasound with the long-term aim of improving treatment planning.