Bibliografía: al final de cada artículo Notas: al pie de texto COMPUTATIONAL PROVENANCE Guest Editor's Introduction / Cláudio T. Silva and Joel E. Tohline. p.9 Provenence for Computational Tasks: A Survey / Juliana Freire; David Koop; Emanuele Santos and Cláudio T. Silva. p.11 Provenence in high - Energy Pyshics Worflows / Andrew Dolgert; Lawrence Gibbons; Christopre D Jones; Valentin Kunzetsov; Mirek Riedewald; Daniel Riley; Gregory J. Sharp and Peter Wittich. p.22 Provenance in Comparative Analysis: A Study in Cosmology / Erik W. Anderson; James P. Ahrens; Katrin Heitmann; Salman Habib and Cláudio T. Silva. p.30 Provenance: The Bridge Between Experiments and Data / Simon Miles; Paul Groth; Ewa Deelman; Karan Vai; Gaurang Mehta and Luc Moreau. p.38 Problem - Solving Methods for Understanding Process Executions / Jose Manuel Gómez and Oscar Corcho. p.47 COLUMNS The Firts Word. p.3 At Issue. p.5 Café Dubois. p.7 The Last Word. p.88 DEPARTAMENTS Visualization Corner. p.53 Education. p.59 Books. p.64 Computer Simulations. p.66 Scientific Programming. p.76 Technologies. p.84