This paper presents WorkWays, a workflow-based science gateway that supports  human-in-the-loop  workflows. The computational steering capability of WorkWays has been used to solve a number of problems in which it is useful for users to study intermediate results and steer the computation. Two of those use cases are discussed in this paper.
['Hoang Anh Nguyen', 'David Abramson', 'Timoleon Kiporous', 'Andrew L. Janke', 'Graham J. Galloway']
WorkWays: interacting with scientific workflows