Science teacher trainers at King’s College London and the Weizmann Institute in Israel collaborated on novel professional development for science teachers. That collaboration had both developmental and research components and the materials on this web-site were produced to help yet more science teachers undertake their own CPD to recognise, refine and improve their current practice. In the UK, that CPD programme has been known as the KREST project (King’s Researching Expert Science Teaching). This website carries two types of document. First, there is a set of documents, which comprises examples from teachers’ portfolios across all 6 of the domains, together with commentaries. Second, there is a set of documents which logs the CPD process for each of the 6 domains.