Acknowledgements: We would like to thank the editor, Mike Pratt, and the three anonymous reviewers for their insightful comments. We would also like to acknowledge the help we received from Paula Jarzabkowski and members of OTREG on earlier drafts, and the support of the Novak Druce Center for Professional Service Firms at the University of Oxford. 2 FROM PRACTICE TO FIELD: A MULTI-LEVEL MODEL OF PRACTICE-DRIVEN INSTITUTIONAL CHANGE ABSTRACTThis paper develops a model of practice-driven institutional change; that is, change that originates in the everyday work of individuals, but results in a shift in field-level logic. In demonstrating how improvisations at work can generate institutional change, we attend to the earliest moments of change that extant research neglects; and we contrast existing accounts that focus on active entrepreneurship and the contested nature of change. We outline the specific mechanisms by which change emerges from everyday work, becomes justified, and diffuses within the organization and field, as well as precipitating and enabling dynamics that trigger and condition these mechanisms.3

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