(1)標(biāo)識(shí)對(duì)象的屬性標(biāo); (2)識(shí)對(duì)象的行為; (3)識(shí)別對(duì)象所屬的類; (4)定義主題詞
1.糾錯(cuò)性維護(hù) 2.完善性維護(hù) 3.適應(yīng)性維護(hù) 4.預(yù)防性維護(hù)