Deltares’ portfolio of collaborative modelling approaches, tools and applications is constantly developing. We apply these to a range of software simulation products (e.g. complex physical simulation models, Bayesian network models, etc.) and topic areas (e.g. flood risk, adaptive delta planning, IWRM, water quality, environment). By applying these approaches to water-related problems, Deltares aims to enhance planning and decision making capacity for both our clients and other stakeholders. These include national and international government agencies, policy makers, private enterprises, non-governmental organisations and various water user groups and associations. The combination and interaction of expert and local forms of knowledge forms the basis to all of our collaborative modelling approaches. Through frequent, interactive and facilitated workshops, we create transparent platforms for knowledge sharing that credibly balance competing stakeholder interests. Directly involving stakeholders in the design, construction and use of modelling tools builds stakeholder trust, understanding and sense of ownership for the developed tools. This helps to ensure their continued use by stakeholders after the conclusion to the planning project. The list of methods we employ includes:
integrated system modeling Group model building and mediated 
Bayesian Modeling Interactive modeling
Serious gaming participatory mapping
Social network analysis of critical infrastructure