These fourteen interviews were conducted in order to investigate multiple aspects: 1) how modellers make modelling decisions, 2) how modellers perceive automation in the modelling process, and 3) how modellers perceive standardisation in the form of guidelines for the modelling process. The interviews were semi-structured and lasted between 1 hour 15 minutes and 2 hours. All interviews were conducted in Dutch, except one, which was in English. These interviews give insight into the social aspects of hydrodynamic modelling, which will improve our understanding of the influence modellers have in general.