This is a description of how EPT (Effective Process Time) is implemented in FACTS-Analyser. EPT is used to model all types of variations a certain process might have, e.g. variations due to failures and/or human/machine variations in execution. The image to the right shows an example of how EPT adds variation to a task time in three steps:

1. A theoretical task time is provided from, for example, a processing time distribution or a table of processing times.
2. A variation pattern (probability density function) is added around the given theoretical task time.
3. The resulting task time (effected by the process variation) are randomly picked, using the probaility density function added in the previous step.

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