+1 to this comment. It is a reasonably sized body of research, too. On top of this, scientific workflow scheduling maps to the classic scheduling problem, which is known to be NP-hard - the fact that the authors infer that automating the traversal is all that is necessary suggests that they have an incomplete understanding of the problem at hand.

For those interested, a nice list of workflow managers, engines, and even languages can be found at https://github.com/pditommaso/awesome-pipeline.