Several authors propose their own technique based on Petri Nets to model wo
rkflow processes. Most of them recognise the adaptability problem inherent
to workflows, viz. the frequently and/or radically changing character due t
o changing business process rules, but suggest totally different solutions.
Because the proposed techniques are fundamentally different, eleven of the
se techniques are briefly discussed and compared. Next, we survey approache
s to reuse in the workflow field and we classify them in a framework derive
d from the information systems literature.