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2013a.00285 Watson, Steven Evans, Sheila Observing changes in teachers' practice as a consequence of taking part in professional development: developing a protocol for the observation of lessons. Smith, C. (ed.), Proceedings of the British Society for Research into Learning Mathematics (BSRLM). Vol. 32, No. 2. Proceedings of the day conference, University of Sussex, UK, June 9, 2012. London: British Society for Research into Learning Mathematics (BSRLM). 88-93 (2012). 2012 London: British Society for Research into Learning Mathematics (BSRLM) EN C70 D40 lesson observation lesson structure professional development secondary teachers' practices Summary: The authors describe the development of a system for lesson observation. This system has been designed to be used to observe changes in teachers' practices as a result of taking part in professional development (PD). The PD promotes and supports secondary mathematics teachers' use of inquiry-based learning and problem-solving. Many approaches to the evaluation of PD rely on the assessment of changes in teachers' thinking and beliefs, largely because of the complexity and difficulty of analysing practice. As part of a design-based research study, the authors develop an observation protocol that allows the rapid analysis of a number of lessons. This involves identifying the lesson structure as an arrangement of episodes. In this way they are able to code episodes and identify changes in the nature and structure of the lesson. This paper describes the ongoing development work and the system that has been developed and trialled so far.