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This talk will describe the challenges in the area of scientific workflows, including how they are used to advance science in a number of domains, and how state-of-the-art software systems, such as Pegasus, meet the application and computing infrastructure challenges.  Pegasus enables scientists to describe the workflows in an abstract, resource-independent way. That description includes the definition of the workflow steps and the data they take in and generate, but does not include low-level cyber-infrastructure information. Given the abstract workflow description and the information about the execution environment (composed of potentially distributed data sources and systems), a planner can map the computational tasks onto the available resources and plan the movement of data across distributed resources. The planning process also opens up opportunities for performance optimization and fault-tolerance. The talk will describe example applications, including LIGO, the gravitational-wave physics experiment that recently confirmed the existence of gravitational waves. The talk will touch upon the issues the applications face, and how Pegasus can help them execute in a number of different environments: campus clusters, distributed resources, and clouds.

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