Core use was defined as the percent of the marketplace using hardware that would accept the security software on its core system; that is, the software solution could be used as the primary security system or as a peripheral, back-up system. Serving as the primary security system was the company's focus at the time of launch. A value of 65% was determined throung interviews with sales management and product managerment groups in the company, suggesting that two-thirds of prospecive customers would be looking for a primary security system