Is there a way to have conditionals and loops for the various steps in a Galaxy workflow? For example, a conditional might be used to branch to various steps based on the previous steps. Also, a step may need to be repeated until it produces a particular output. Here is an actual use case: We are invoking a web service in one of our workflows. The first step returns a unique identifier that you need to use later in order to get the actual results (since the web service operation is asynchronous). Later, using another operation, you can check on the status of the job being performed. Sometimes, this operation/step will inform us that the results are not ready. We would like to be able to loop on that second operation/step until it says the job is done, and then move on to a third operation/step to actually get the results. Any ideas? Sincerely, Michael E. Cotterell Ph.D. Student in Computer Science, University of Georgia Instructor of Record, Graduate RA & TA, University of Georgia Department Liaison, CS Graduate Student Association, University of Georgia mepcotterell@gmail.com (mailto:mepcotterell@gmail.com) mepcott@uga.edu (mailto:mepcott@uga.edu) mec@cs.uga.edu (mailto:mec@cs.uga.edu) http://michaelcotterell.com/