Abstract: Described computer systems permit computationally efficient, sophisticated analysis and modeling of groups of data items (e.g., data profiles, agreements) in connection with a model to understand and quantify threats posed to resources described by the groups of data items as a whole. This permits involved parties to take appropriate mitigation measures, such as allocation and movement of emergency equipment and personnel, or other resources. The systems are applicable to situations in which there are multiple possible hazards and which involve multiple parties, and thus cannot be conveniently understood manually or efficiently analyzed by conventional computing methods.