This chapter is an introduction to documentary sign linguistics. I am going to focus mostly on the British Sign Language Corpus Project, based at the Deafness, Cognition and Language Research Centre, University College London — in particular, issues to do with data collection (e.g., the Observer's Paradox) and the notion of having an open access archive. Unlike some other corpus projects (e.g., the Auslan Archive or the Sign Language of the Netherlands (NGT) Corpus) which received funding

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... ically for the creation of a corpus, the funding for the BSL Corpus Project comes from a grant by the Economic and Social Research Council (ESRC) as part of a research project to create a corpus while conducting linguistic research into BSL. The key research questions focus primarily on issues related to sociolinguistic variation and change in BSL. Obviously corpus data lends itself rather well to this kind of study, and I will explain below why we have such an interest in variation.