00339nam a2200121 a 4500008004100000050001800041100002300059245003700082246002800119260003700147300002400184350000900208120416s1977    ||||||||||||||||| ||    u  aHF 5548.2 Cam  aCampbell, Bonita J10aUnderstanding Informatin systems  afoundations for control  aCambridge, Mass.bWinthropc1977  axviii, 153p. : ill.  a0.00