Page 111 -

98 N. Russell and A. ter Hofstede
A quality management process exists within a company to receive improvement
recommendations from staff
An instance of the process is triggered when an improvement suggestion is
received
The first step in the process is to register the suggestion
Two subsequent activities are then triggered in parallel: (1) a request for further
information is sent to the staff member and (2) the initial suggestion evaluation
occurs
After the request for further information has been sent, there is a 14 day wait-
ing period for a response. If further details are received within this time frame,
then the process response task executes. If not, then the process response task is
skipped. In either case, the state after the process response task has executed or
been skipped is known as the response handling complete state
After the initial suggestion evaluation has completed, depending on the outcome,
one of two possible states is entered: either (1) the decision is made to accept the
suggestion for action or (2) the decision is made to reject the suggestion and the
processing complete state is entered
If the decision is made to accept the suggestion, and the response handling com-
plete state has been reached, then a detailed examination of the suggestion occurs
to determine what resolution action to take
After the detailed examination has completed, the proposed response to the
improvement suggestion is forwarded to a manager for confirmation
If the confirmation outcome is positive, then the resolution task executes
If the confirmation outcome is negative, the process reverts to the accept the
suggestion state
After the resolution task has completed, the processing complete state is entered
The archive task can execute once the process is in the response handling
complete and processing complete state. The process then terminates.

Exercise 4. Model the following process as a Petri net and then as a YAWL model.
Highlight the differences between the two models.

An accident investigation process exists within a farm machinery manufacturing
organization to assess whether any reported farm accidents require modifications
to machinery currently being made
An instance of the process is reported each time an accident is reported
The first task to execute is the travel to accident location task
After this task, two subsequent tasks are initiated in parallel: (1) the review
situation task and (2) the determine if investigation required task
Once the review situation task has completed, multiple concurrent instances of
the interview witness task are executed concurrently depending on the number of
witnesses who saw the accident
The determine if investigation required task allows a summary decision to be
arrived at as to whether to complete a full investigation of the accident or not. If