A system for generating data indicative of a predicted outcome relating to a staged process such as a boxing or football match or a microprocessor calculation, the staged process involving one or more resources, each having parameters associated therewith, and comprising one or more stages, each stage having a plurality of possible occurrences associated therewith, the system comprising: ```a storage system arranged to store first data indicative of generalised probabilities associated with an occurrence and second data indicative of said parameters; ```a processing system arranged to retrieve said first and second stored data so as to modify the generalised data whereby to generate data indicative of probabilities particular to the or each resource for at least one occurrence of each stage, ```wherein the processing system is arranged to combine the probabilities associated with the stages so as to generate data indicative of a probability of at least one outcome for the process.
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