While organisational collaborations are increasingly common they often fail. More effective design of collaborations shouldbe facilitated by improved understanding of the relationships created. It is suggested that while the most commonly usedtheoretical lens is transaction cost economics it might not be the most appropriate. Resource dependency theory is proposedas an alternative since it allows for consideration of internal as well as external relationships and is focused on improvingunderstanding rather than optimisation. Grounded in the theory, Dependency Network Diagrams (DNDs) is the modellingtechnique identified as the most appropriate to capture the essence of a collaboration’s relationships. A case study ofEnergyCo is presented illustrating how DNDs can be used to document relationships and so serve as an effective foundationfor facilitating discussion, enhancing understanding, and contributing to the design of effective collaborations.