METHODS: Study metrics were recorded. Learning points were captured during network development, categorized and included in a thematic analysis from which lessons learnt were identified.

RESULTS: 12 trials were supported by sites coordinated at national level and integrated at European level. A total of 9 CDA cycles were completed, resulting in 436 site CDAs signed in a median of 8.11 days. Lessons learnt included the importance of: relationship building by early engagement with partners; reducing misunderstanding by clear communication; flexibility, adaptability and experiential learning which are required for service improvement. Practical actions that infrastructure developers and users can take include operational planning with a view to fostering collaborations across stakeholders, sharing information about different approaches to clinical operations, and raising awareness of the need for explicit work on collaboration, communication, and planning. Traditionally, these activities are repeated for each trial. The use of a persistent network allows the benefits of collaboration to be recycled.