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From Shared Databases to Communities of Practice: A Taxonomy of Collaboratories

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Dataset and Sampling Methods. Crane (1972) first described the loosely-affiliated but highly interactive networks of scientists as "invisible colleges." 2003; Stokols, Harvey, Gress, Fuqua, & Phillips, 2005). Dataset and Sampling Methods. Patton (1990) provides a taxonomy of purposive sampling techniques.