A method of generating a multi-dimensional model comprises receiving data defining multiple resource types, receiving metadata defining a hierarchical organization for one or more resource types, a hierarchical resource type for a respective resource type defining multiple levels of aggregation, and composite resource types for one or more groups of resource types, a composite resource type defining a composition of resource types, and generating the multi-dimensional model from the received data and received metadata, the generating comprising creating a multi-dimensional function for each resource type and for each composite resource type.