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2 The Language: Rationale and Fundamentals 83

Fig. 2.41 Piled execution initiation in the Resource Service’s worklist

Table 2.8 User privileges supported in YAWL
Privilege Explanation
Choose The ability to select the next work item to start execution on
Concurrent execution The ability to execute more than one work item simultaneously
Reorder The ability to reorder items in the worklist
View team The ability to view work items offered to other users in the
same team(s) as a given user
View group The ability to view work items allocated to other users in
the same group(s) as a given user
Chained execution The ability to enter the chained execution operating mode
Manage cases The ability to administer cases and redistribute work items to users

The actual screen for doing this forms part of the runtime environment and is
shown in Fig. 2.43.
Additionally, there are also privileges that can be set for individual tasks. These
are summarized in Table 2.9.
The facility for specifying these options forms part of the YAWL editor. The
actual screen for specifying task privileges is shown in Fig. 2.42.

2.6.6 Resource Patterns Coverage

The resource perspective in YAWL has been heavily influenced by the resource
patterns, and it provides comprehensive support for them as indicated in Table 2.10.
In total, it directly implements 37 of the 43 resource patterns. As YAWL assumes