Modeling early requirements in Tropos: a transformation based approach Paolo Bresciani and Anna Perini ITC-Irst via Sommarive, 18 I-38050 Trento-Povo, Italy telephone: +39 0461 314342 bresciani@irst.itc.it perini@irst.itc.it Paolo Giorgini and Fausto Giunchiglia Department of Information and Communication Technology University of Trento I-38050 Trento-Povo, Italy pgiorgini@cs.unitn.it fausto@cs.unitn.it John Mylopoulos Department of Computer Science University of Toronto M5S 3H5, Toronto, Ontario, Canada jm@toronto.edu Keywords ABSTRACT 1. INTRODUCTION Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Copyright 2000 ACM 0-89791-88-6/97/05 .. 5.00