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2 The Language: Rationale and Fundamentals 75
Table 2.7 Work item interaction strategies supported in YAWL
Offer Allocation Start Effect
SSS System System System The system directly allocates work to a resource and
it is automatically started.
SSR System System Resource The system directly allocates work to a resource. It is
started when the user selects the start option.
SRS System Resource System The system offers work to one or more users. The first
user to choose the select option for the work item
has the work item allocated to them and it is auto-
matically started. It is withdrawn from other users’
worklists.
SRR System Resource Resource The system offers work to one or more users. The first
user to choose the select option for the work item
has the work item allocated to them. It is withdrawn
from other users’ worklists. The user can choose
when to start the work item via the start option.
RSS Resource System System The work item is passed to a manager who decides
which resource the work item should be allocated
to. The work item is then directly allocated to that
user and is automatically started.
RSR Resource System Resource The work item is passed to a manager who decides
which resource the work item should be allocated
to. The work item is then directly allocated to that
user. The user can choose when to start the work
item via the start option.
RRS Resource Resource System The work item is passed to a manager who decides
which resource(s) the work item should be offered
to. The work item is then offered to those user(s).
The first user to choose the select option for the
work item has the work item allocated to them and
it is automatically started. It is withdrawn from all
other user’s worklists.
RRR Resource Resource Resource The work item is passed to a manager who decides
which resource(s) the work item should be offered
to. The work item is then offered to those user(s).
The first user to choose the select option for the
work item has the work item allocated to them. It
is withdrawn from all other users’ worklists. The
user can choose when to start the work item via the
start option.

the perspective of the resource, each interaction strategy results in a distinct experi-
ence in terms of the way in which the work item is distributed to them. The range of
strategies supported range from highly regimented schemes (e.g., SSS), where the
work item is directly allocated to the resource and started for them, and the resource
has no involvement in the distribution process through to approaches that empower
the resource with significant autonomy (e.g., RRR), where the act of committing to
undertake a work item and deciding when to start it are completely at the resource’s
discretion.