Abstract: Embodiments relating to a computer-implemented process, an apparatus and a computer program product is provided for crawling rich Internet applications. In one aspect the method includes executing an event in a set of events discovered in a state exploration phase according to a predetermined priority of events in each set of events in the sets of events discovered, wherein the event from a higher priority is exhausted before an event from a lower priority is executed and determining any transitions. Responsive to a determination that there are at least one transition any remaining set of events is executed in a transition exploration phase. In addition the method determines the existence of any new states as a result of executing an event in the set of events and returns to the state exploration phase, responsive to a determination that a new state exists.