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1.5 Play-in, Play-out, and Replay 19

Fig. 1.8 Three ways of relating event logs (or other sources of information containing example
behavior) and process models: Play-in, Play-out,and Replay

than 56 cigarettes tend to die young”) and association rules (“people that buy di-
apers also buy beer”). Unfortunately, it is not possible to use conventional data
mining techniques to Play-in process models. Only recently, process mining tech-
niques have become readily available to discover process models based on event
logs.
Replay uses an event log and a process model as input. The event log is “re-
played” on top of the process model. As shown earlier it is possible to replay trace
a,b,d,e,h on the Petri net in Fig. 1.5; simply “play the token game” by forc-
ing the transitions to fire (if possible) in the order indicated. An event log may be
replayed for different purposes:
• Conformance checking. Discrepancies between the log and the model can be
detected and quantified by replaying the log. For instance, replaying trace
a,b,e,h on the Petri net in Fig. 1.5 will show that d should have happened
but did not.