The Minneapolis-based Ceridian Corp successor company to Control Data Corp has acquired Paragon Imaging Inc as a present for its Computing Devices International, which has substantial operations in Canada and a UK base. Paragon, based in Woburn, Massachusetts, did about $5m in 1993 with its defence-related imaging software which is used primarily by the US Department of Defense’s intelligence community and service commands. Ceridian also bought the assets of Human Effectiveness Inc, Chicago employee assistance provider, and Payroll Tax Management Inc, a payroll tax filing operation in Glendale, California, for its Employer Services arm. No terms.