Occasionally, GMDSI publishes a monograph, either as a document or perhaps a video, on a subject of modelling importance. Though technical in nature, GMDSI monographs are targeted at a broad audience. Their purpose is to cogently challenge ways in which decision-support groundwater modelling is traditionally undertaken using arguments that are based on logic and experience. These arguments are presented in ways that make them easy to read or listen to, whether you are a modeller, or a stakeholder in model-based groundwater management.