The Swiss Open Access Monitor, or National Open Access Monitor (NOAM), is a project to collect, visualise and make available data on OA shares at Swiss and institutional level via a dedicated website. This is in line with the requirement of swissuniversities and its members to measure the degree of fulfilment of the Swiss National Strategy on Open Access, which aims to ensure all publicly funded research to be OA by 2024. Locating this project at the Consortium of Swiss Academic Libraries ensures the involvement of all swissuniversities members and the Swiss National Science Foundation (SNSF). The swissuniversities “Open Science” program and the Consortium share the project funding. This presentation focuses on the essential collaborations which had a lasting impact on the project’s outcome. The strategic partnership with Forschungszentrum Jülich, who also developed the German Open Access Monitor, enabled NOAM to build on an established infrastructure. Especially during the conception of a survey to collect institutional repository data, the different focuses, cultures and standards of the institutions became transparent. Assembled in a project task force, experts from the Arbeitskreis Open Access (AKOA) accompanied and advised the project from the start. The close collaboration with almost twenty representatives from Swiss Universities, the ETH domain, Universities of Applied Sciences, Universities of Teacher Education and the SNSF proved to be the linchpin for the success of this project.