Abstract
An event has nondeterministic effects if the event can have two or more alternative effects. Here it represents nondeterministic effects of events in the event calculus by allowing event occurrences to give rise to several classes of models. This chapter describes two ways of representing nondeterministic effects in the event calculus: determining fluents and disjunctive event axioms. These techniques enable the representation of uncertainty about the effects of events. One way of representing nondeterministic effects is to use determining fluents. A determining fluent is a fluent that is released from the commonsense law of inertia so that its truth value is permitted to vary arbitrarily from timepoint to timepoint and is used in the condition of one or more effect axioms in order to determine the effects of events on other fluents.
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