Appendix A The Future of Workflows Wil van der Aalst has copyrights to almost all figures in the following slideshow made by Lars Frank.

Adoptive workflow

Errors resulting from change:

Transient/semantic problem: It is not always possible to change model!

Dynamic change problem: What is the problem?

Problem 2: Management information. Does a hierarchical workflow use aggregation or abstraction?

Example of aggregation

Interorganizational workflow: The following cases are in Lars Frank view too superficial as they do not have enough parallellity! Describe a better solution after the slideshow?

Overview example with 8 sub-examples:

Example contd. Illustration of a production with a single sub- contractor. Illustrate a workflow where it is possible to have any number of sub- contractors that execute subprocesses in parallel?

Example contd. 2.

UML-Statechart diagram for a global transaction Syntax for State diagrams: Event [condition] /Action

Workflow of flexible transactions.

Petri net Work flow for global E-commerce transactions where the stocks are in the locations of the different suppliers. OR split

Sub- Petri net of activity 2 AND split OR split AND join

Example contd. 3.

Example contd. 4.

Example contd. 5.

Example contd. 6.

Example contd. 7.

Example contd. 8.

Case study: E-bookstore.

Step 1, Total workflow. The workflow does not give an overview!

Step 2, Overview:

Step 2a, Customer: If the customer uses a PC it may be OK that the Customer waits for a synchronous answer as illustrated, but the server should answer asynchronously.

Step 2b, bookstore: How would you illustrate that the bookstore server should answer asynchronously?

UML-Statechart diagram for a global transaction Syntax: Event [condition] Action

Step 2c, Publisher: How would you illustrate that the publisher server should answer asynchronously?

Step 2d, Shipper:

Step 3, Bookstore (imprecise model)

Step 3b, Publisher:

Step 3c, Shipper:

Step 3d, Overview:

End of session Thank you !!!