Department of Computer Science, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA;School of Innovation, Design and Engineering, Mälardalen University, 100 Institute Road, Västerås, MA, Sweden;Centre for Distributed Systems and Software Engineering, Monash University, 100 Institute Road, Melbourne, MA, Australia;Centre for Distributed Systems and Software Engineering, Tufts University, Computer Science, Boston, 161 College Avenue, Medford, MA, Australia;Centre for Distributed Systems and Software Engineering, Microsoft, 161 College Avenue, Medford, MA, Australia