We investigate interoperability aspects of Grid workflow systems with respect to models of computation (MoC), workflow languages, and workflow
We focus on the problems that affect interoperability and illustrate
how these problems are tackled by current scientific workflows as well
as how similar problems have been addressed in related areas.
Emphasis is given to the differences and similarities between local
and Grid workflows and how their peculiarities have a positive or
negative impact on interoperability.
Our long term objective is to achieve (logical) interoperability
between workflow systems operating under different MoCs, using distinct
language features, and using different execution environments.