某软件系统投入运行10天，计划运行时间为每早8点至晚6点。第二天上午发生一次失效，故障恢复用了1小时。第4天上午发生一次失效，故障恢复用了4小时。第9天上午发生一次失效，故障恢复用了1小时。根据《软件工程产品质量GB/16260—2006》，该软件系统的有效性（或可用性，availability）为 （ ） 。
- A.98%
- B.95%
- C.80%
- D.94%
正确答案及解析
正确答案
解析
有效性：在要求的外部资源得到保证的前提下，产品你在规定的条件下和规定的时刻或 时间区间内处于可执行规定功能状态的能力。它是产品可靠性、维修性和维修保障性的综合反映。该软件系统运行时间为每早8点至晚6点，每天10个小时，在这10个小时中该软件系统的有效性为（10′10-1-4-1）/﹙10′10﹚=94%。
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