Sunday, 28 April 2013 09:26

Chapter 2 - Process-Aware Information Systems

2.1. Process Perspectives

Think of a business process you are familiar with that utilizes a PAIS (e.g., ordering goods in a Web shop or performing a financial transaction using Internet banking). Give examples of the different perspectives on a PAIS using this scenario.


2.2. Process Instances, Activity Instances and Work Item

  • Consider the states of a process instance as illustrated in Fig. 2.12. Explain the difference between states Completed and Terminated.
  • What is the relationship between the lifecycle of an activity instance (cf. Fig. 2.14) and the one of a single work item (cf. Fig. 2.18)?
  • Consider the lifecycle of an activity instance from Fig. 2.14. What exactly is the difference between states Enabled and Running?

Which of the following statements are true?

  • A worklist may contain more than one work item.
  • Each activity instance is associated with exactly one work item.
  • For a process instance in state Running multiple work items related to the same activity instance may exist at a certain point in time.
  • A work item switches from state Offered to state Withdrawn if another work item related to the same activity instance is allocated by a user.


Fig. 2.12 Possible States and State Transitions of a Process Instance

Fig. 2.14 States and State Transitions of an Activity Instance


Fig. 2.18 Work Item Lifecycle from the Perspective of a Particular Actor 


2.3. Application Data, Process-relevant Data, and Process Control Data

  • Describe the differences between application data, process-relevant data and process control data. Give examples.
  • Explain how data may be exchanged between a started activity instance and the application service invoked during its execution.
  • Describe how data is passed between the activities of a process instance.


2.4. Build-time and Run-time Components of a PAIS

Give examples of build- and run-time components of a PAIS. What services are offered by them?

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