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The word "maintenance" suggests fixing parts that are broken and replacing parts that wear out. Software is not subject to wear in the sense that mechanical systems are, so it can never wear out; therefore maintenance would appear to mean simply fixing faults in the original implementation. This ignores the problems of rapidly changing environments and requirements: An aircraft engineer would not consider upgrading a Cessna light aircraft to a supersonic jet airliner to be a "maintenance task"(!). Yet there are many software systems that have had to undergo similarly dramatic enhancements. These considerations suggest that the word "maintenance" should be replaced by "reengineering" or "evolution." ά»¤Ö¸µÄÊÇÐÞ²¹Ë𻷵IJ¿·ÖºÍÌæ»»Ä¥ËðµÄ²¿·Ö£¬Èí¼þ²¢²»Ïó»úеϵͳÄÇÑù»áÄ¥Ëð£¬ËýÓÀÔ¶²»»áËð»·£¬ËùÒÔά»¤ÖªÊ¶ÔÚÔʼʵÏÖÖмòµ¥µØÐÞ²¹´íÎó¡£ÕâºöÂÔÁË¿ìËٱ仯µÄ»·¾³ºÍÐèÇóÎÊÌ⣺·É»ú¹¤³Ìʦ²¢²»»á½«·É»úµÄ·¢¶¯»úµÄÉý¼¶¿´×÷¡°Î¬»¤ÈÎÎñ¡±£¬¶øÐí¶àÈí¼þϵͳ²»µÃ²»×÷ÀàËÆµÄÌáÉý£¬´ÓÕâ¸öÒâÒåÉÏά»¤µÄº¬ÒåÓ¦¸Ã±»Ì滻Ϊ¡°ÔÙ¹¤³Ì¡±»ò¡°ÑÝ»¯¡±¡£ [ Last edited by »ÃÓ°ÎÞºÛ on 2006-10-3 at 13:48 ] |
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yuefour
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2Â¥2005-06-11 10:06:39
wang587111
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3Â¥2007-03-07 14:21:32













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