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Pegasus is a planning framework for mapping abstract workflows for execution on the Grid. This paper presents the implementation of a web-based portal for submitting workflows to the Grid using Pegasus. The portal also includes components for generating abstract workflows based on a metadata description of the desired data products and application-specific services. We describe our experiences in using this portal for two Grid applications. A major contribution of our work is in introducingdoi:10.1145/1066677.1066834 dblp:conf/sac/SinghDMVSBGJKLBK05 fatcat:w5bpwnsrvnb5zjxdwnlzxios2y