SSI: Distributed Workflow Management Research and Software in Support of Science DeelmanEwa VahiKaran RyngeMats MayaniRajiv TanakaRyan Ferreira da SilvaRafael PapadimitriouGeorge DoTu Mai Anh LivnyMiron CoatsworthMark 2020 Pegasus is a system for mapping and executing abstract application workflows over a range of execution environments.