During task composition, such as can be found in
distributed query processing, workflow systems and AI
planning, decisions have to be made by the system and
possibly by users with respect to how a given problem
should be solved. Although there is often more than
one correct way of solving a given problem, these
multiple solutions do not necessarily lead to the
same result. Some researchers are addressing this
problem by providing data provenance information.
Others use expert advice encoded in a supporting
knowledge-base. However, users do not usually trust
complete automation during...