“…Most authors have seen fit to model prior information as initially assigned at the component level, for example, Hamilton and Drenna (1964), Breipohl et al (1965), Byers et al (1974), Wolf (1976), and David (1987); others, and these are fewer in number, have chosen to model prior information as initially assigned at the system level; among these are Parker (1972) and Mastran and Singpurwalla (1978).…”