Though the decision problems at the five DITTY test sites were to a large extent different, it is stressed that all of them were easily accommodated in the DITTY-DSS structure of Fig. 1, thus confirming its flexibility and ease of use. This conclusion is strengthened by the fact that several important DSSs developed for specific water management applications, such as Carvalho (2002) and Myšiak et al. (2005), fit in the general structure proposed in this paper. Hence, the structure described in Fig. 1 can be considered as a unitary framework for existing and future water management DSSs.