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Throughout this book, we speak of classifications as objects for cooperation across social worlds, or as boundary objects...objects that both inhabit several communities of practice and satisfy the informational requirements of each of them.... They are objects that are able both to travel across borders and maintain some sort of constant identity. They can be tailored to meet the needs of any one community (they are plastic in this sense, or customizable). At the same time, they have common identities across settings. ... They are thus both ambiguous and constant; they may be abstract or concrete.
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