BY BRUCE G. BUCHANAN Department of Computer Science University of Pittsburgh Pittsburgh, Pa.
" When databases are distributed, the tradeoff between consistency of files and their availability is exacerbated. A new paper presents a variation of the voting algorithm that achieves greater availability than other algorithms and, moreover, that is proved to be correct.
S. Jajodia, D. Mutchier, “A pessimistic consistency control a1gorithm for replicated tiles which achieves high availability,” " IEEE Transactions on Software Engineering, 15, 3946, January 1989.
" A recent study summarizes the measurements and analyses of nearly 60 software development projects over a period of 12 years. These are mostly Fortran programs ranging from 3,000 to 170000 lines of code. The costs of gathering and analyzing data on software.
" development are discussed and are concluded to be outweighed by the benefits in managing a large software project.
J.D. Valett, FE. McGarry...