In this paper, we build on a growing body of research on practical measurement for educational improvement, contributing a conceptualization of the organizational functions of measurement in processes of persistence and change. Our work is grounded in theoretical understandings of micro-institutional change that foreground processes of reproduction and disruption of organizational categories, priorities, assumptions, and practices. Drawing together measurement discourses from multiple fields of study, we identify four metaphors for organizational functions that measures can serve: carriers, windows, exercises, and drivers. We propose a conceptual framework illustrating relationships and pathways among these functions as they operate in context. We then apply the framework in the context of co-designing three practical measures of science teacher learning in a large urban district, illustrating varied pathways through which the practical measures seemed to function, and documenting their respective affordances and constraints in driving reproduction and/or disruption in the organization's work to support science teacher learning. This line of work extends prior research on practical measurement through its focus on measures of science teacher learning and its attention to how practical measures can function to shape broader processes of organizational transformation and stability. This paper is part of the special issue on Teacher Learning and Practice within Organizational Contexts.