The assessment of primary care organizations is considered to be essential for improving care. However, the assessments’ acceptability to professionals poses a challenge. Developing assessment programmes in collaboration with the end-users is a strategy that is widely encouraged to make interventions better targeted. By doing so, it can help to prevent resistance and encourage adherence to the assessment. This process, however, is rarely reported. This paper aims to fill this gap by describing the process of the co-production of an assessment programme for community health centres (CHCs) affiliated to the Federation of Community Health Centres (FCHC) in French-speaking Belgium. We conducted a documentary study on the co-production of the assessment programme before carrying out semi-structured interviews with the stakeholders involved in its development.CHCs in French-speaking Belgium are increasing in number and are becoming more diverse. For the FCHC,this growth and diversification pose challenges for the meaning of CHC (an identity challenge) and what beneficiaries can expect in terms of the quality of organizations declaring themselves CHC (a quality challenge). Faced with this double challenge, the FCHC decided to develop an assessment programme, initially called Label, using participatory action research. During the co-production process, this initial programme version was abandoned in favour of a new name “DEQuaPâ€. This new name embodies new objectives and new design regarding the assessment programme.When studying the co-production process, we attributed these changes to two controversies. The first concerns how much and which type of variety is desired among CHCs part of the FCHC. The second concerns the organization of the FCHC in its capacity as a federation. It shed light on tensions between two professional segments that, in this paper, we called “political professionalism†and “pragmatic professionalismâ€.These controversies show the importance of underlying challenges behind the ...