... 1993¹¹

Correspondence may be directed to the TSQL electronic mail distribution, tsql@cs.arizona.edu, or to the editor at Aalborg University, Datalogi, Fr. Bajers Vej 7E, DK–9220 Aalborg ├ÿ, Denmark, csj@iesd.auc.dk. Affiliations and e-mail addresses of the authors follow. J. Clifford, Information Systems Dept., New York University, jcliffor@is-4.stern.nyu.edu; C. Dyreson, Computer Science Dept., University of Arizona curtis@cs.arizona.edu; S. K. Gadia, Computer Science Dept., Iowa State University, gadia@cs.iastate.edu; F. Grandi, University of Bologna, Italy, fabio@deis64.cineca.it; N. Kline, Computer Science Dept., University of Arizona, kline@cs.arizona.edu; A. Montanari, Dip. di Matematica e Informatica, Universit├á di Udine, Italy, montanari@uduniv.cineca.it; D. Nonen, Computer Science Dept., Concordia University, Canada, daniel@cs.concordia.ca; E. Peressi, Dip. di Matematica e Informatica, Universit├á di Udine, Italy, peressi@udmi5400.cineca.it; B. Pernici, Dip. di Matematica e Informatica, Universit├á di Udine, Italy, pernici@ipmel2.polimi.it; J. F. Roddick, School of Computer and Information Science, University of South Australia roddick@unisa.edu.au; A. Segev, School of Business Adm. and Computer Science Research Dept., University of California, segev@csr.lbl.gov; N. L. Sarda, Computer Science and Eng. Dept., Indian Institute of Technology, Bombay, India, nls@cse.iitb.ernet.in; M. R. Scalas, University of Bologna, Italy, rita@deis64.cineca.it; R. T. Snodgrass, Computer Science Dept., University of Arizona, rts@cs.arizona.edu; A. Tansel, Bernard M. Baruch College, City University of New York UZTBB@CUNYVM.CUNY.EDU; P. Tiberio, University of Bologna, Italy, tiberio@deis64.cineca.it.