This article explores sense-making in a municipality-led temporary organization established in response to the introduction of a new curriculum and marking system in Sweden. Qualitative data were extracted from audio-recorded interviews (n = 18) and observations of central subject group meetings (n = 6). By applying core elements of sociological theories of sense-making, the findings suggest that participants established coherent knowledge structures by pragmatic task interpretation and reduction of complexity in connection with disruptions of the work. The forms of complexity reduced were related to the specific tasks assigned and the separate, short-term nature of the organizational units. The article concludes that the process of sense-making impacts the character and outcome of development efforts by temporary organizations.