The terms Decision Support Tools or Decision Support Systems (DSS) refer to a wide range of computer-based tools (simulation models, and/or techniques and methods) developed to support decision analysis and participatory processes. A DSS consists of a database and different tools coupled with models and is provided with a dedicated interface in order to be directly and more easily accessible by non-specialists (e.g. decision makers). DSS have specific simulation and prediction capabilities but are also used as a vehicle of communication, training and experimentation. Principally, DSS can facilitate dialogue and exchange of information thus providing insights to non-experts and supporting them in the exploration of management and policy options.