This study explores the decisive aspects during an evaluation for the viability of an existing innovative interorganisational partnership. This research focuses on six interorganisational partnerships within the maritime sector, using semi-structured interviews conducted with eleven participants from two perspectives, the strategic and the operational. The analysis found three aspects to be decisive during an evaluation, which are the task-related, the partner-related and the environment-related aspect. Among these three aspects, ten categories are found. This research provides academic contributions and practical recommendations for organisations and individuals involved in an innovative interorganisational partnership. Among these practical recommendations, the trigger for an evaluation, the criteria for an evaluation, and the involved individuals who should execute the evaluation are provided.