Extending the Planetlab Usage Model for Distributed Heterogeneous Research Testbeds Roberto Canonico Dipartimento di Informatica e Sistemistica Università di Napoli Federico II via Claudio, 21 80125 Napoli, ITALY roberto.canonico@unina.it Giorgio Ventre Dipartimento di Informatica e Sistemistica Università di Napoli Federico II via Claudio, 21 80125 Napoli, ITALY giorgio@unina.it Salvatore D’Antonio Consorzio Interuniversitario Nazionale per l’Informatica - CINI Laboratorio ITeM via Cinthia 80126 Napoli, ITALY saldanto@unina.it ABSTRACT Categories and Subject Descriptors General Terms 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 pro£t or commercial advantage and that copies bear this notice and the full citation on the £rst page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior speci£c permission and/or a fee. ROADS Warsaw’07, July 11-12, 2007, Warsaw, Poland. Copyright 2007 ACM ISBN 978-1-59593-972-2/07/07...$5.00 Keywords 1. INTRODUCTION 2. TESTBED USAGE MODELS