1、軟件工程xxxx研序言(編輯修改稿)
2025-03-09 12:26 本頁面
【文章內(nèi)容簡(jiǎn)介】 information and billing for Australia39。s largest water provider is canceled in 2023, due to inadequate planning, numerous change requests, and cost and schedule overruns. ?COST: $ million CQUPT 葛君偉 22 London Stock Exchange ?Effort to design new stock settlement system is scrapped in 1993, after seven years, because of overly plex and cumbersome design and poor project management. ?COST: $600 million CQUPT 葛君偉 23 國(guó)內(nèi)失敗案例 … ?資源一號(hào) 02型 –飛行兩年，在 1473圈，變軌沒有成功 ?發(fā)現(xiàn)是潛通道問題。系統(tǒng)實(shí)現(xiàn)是分散到五個(gè)子程序，變量在前一個(gè)模塊被清掉，需要姿態(tài)正常，才能開發(fā)動(dòng)機(jī)。 ?方法：把部分程序重新設(shè)計(jì)，再送上去 CQUPT 葛君偉 24 國(guó)內(nèi)失敗案例 … ?三號(hào)衛(wèi)星 – 2023年 11月發(fā)射， 12月 ，有四次進(jìn)入異常工作模式。 – 分析：異常指令－內(nèi)存?zhèn)飨聛矸治觯l(fā)現(xiàn)是軌道計(jì)算發(fā)現(xiàn)尋址跳變。減法運(yùn)算指令，是否帶進(jìn)位關(guān)系到結(jié)果正確。 CQUPT 葛君偉 25 國(guó)內(nèi)失敗案例 ?神州飛船 –返回的前天晚上，發(fā)現(xiàn)異常，發(fā)現(xiàn)發(fā)動(dòng)機(jī)通訊有短暫不成功。 ?神州二號(hào) –發(fā)射逃逸模式，發(fā)出指令卻沒有轉(zhuǎn)化到逃逸模式。 –問題：時(shí)間清零問題 CQUPT 葛君偉 26 The problem only gets worse as IT grows ubiquitous ?Of the IT projects that are initiated, from 5 to 15 percent will be abandoned before or shortly after delivery as hopelessly inadequate. ?Many others will arrive late and over budget or require massive reworking. ?Few IT projects, in other words, truly succeed. CQUPT 葛君偉 27 WHEN A SOFTWARE PROJECT FAILS, … ?it jeopardizes an anization’s prospects. ?it may steal the pany’s entire future. – A poorly implemented resource planning system led FoxMeyer Drug Co., a $5 billion wholesale drug distribution pany in Carrollton, Texas, to plummet into bankruptcy in 1996. CQUPT 葛君偉 28 WHEN A SOFTWARE PROJECT FAILS, … ?IT failure in government can imperil national security. – The $170 million VCF (FBI’s Virtual Case File) system instead ended without any system’s being deployed. ?IT failures can stunt economic growth and quality of life. – AIR JAM: The . Federal Aviation Administration spent $ billion trying to upgrade its airtraffic control system from 1981, only to cancel the project in 1994. Gridlocked skies are still with us today. 由航班延誤造成的經(jīng)濟(jì)損失累計(jì)高達(dá) 500億美元。 CQUPT 葛君偉 29 WHEN A SOFTWARE PROJECT FAILS, … ?Failure can be defined as the total abandonment of a project before or shortly after it is delivered. ?In 2023, the . government spent $60 billion on software (not counting the embedded software in weapons systems). – A 5 percent failure rate (at least) means $3 billion was probably wasted. – A 15 to 20 percent failure rate (more probably), which have budgets
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