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  1. Bots and humans can combine in multiple ways in the service of knowledge production. Designers make choices about the purpose of the bots, their technical architecture, and their initiative. That is, they decide about functions, mechanisms, and interfaces. Together these dimensions suggest a design space for systems of bots and humans. These systems are evaluated along several criteria. One criterion is productivity. Another is their effects on human editors, especially newcomers. A third is sustainability: how they persist in the face of change. Design and evaluation spaces are described as part of an analysis of Wiki-related bots: two bots and their effects are discussed in detail, and an agenda for further research is suggested. 
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