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Enhancing a software product may consume (73) percent of the total life-cycle effort.

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Ⅰonly  Ⅱ only  Ⅰ+Ⅱ  all of above  
①②  ①③④  ②③④  ①②③④  
①②  ①③④  ②③④  ①②③④  
analysis  design  implementation  Maintenance  
Ⅰ  Ⅱ  Ⅰ, Ⅱ  以上都是  
system documentation  user documentation  vender documentation  product documentation  
system documentation  user documentation  vender documentation  product documentation  
rounds  loops  iterations  circularities  

The preliminary design is an internal document used only by programmers  The preliminary design is the result of mapping product requirements into software and hardware functions  The preliminary design of the product comes from the requirement specification  The developers produce the preliminary design by defining the software structure in enough detail to permit coding  

rounds  loops  iterations  circularities  
making enhancements to software products  developing a new software product  correcting problems  adapting products to new environments  
analysis  design  implementation  maintenance  
The preliminary design is an internal document used only by programmers  The preliminary design is the result of mapping product requirements info software and hardware functions  The preliminary design of the product comes from the requirement specification  The developers produce the preliminary design by defining the software structure in enough detail to permit coding  
Ⅰ only  Ⅱ only  Ⅰ and Ⅱ  all of above  
The preliminary design is an internal document used only by programmers  The preliminary design is the result of mapping product requirements into software and hardware functions  The preliminary design of the product comes from the requirement specification  The developers produce the preliminary design by defining the software structure in enough detail to permit coding  
①②  ①③④  ②③④  ①②③④  
①②  ①③④  ②③④  ①②③④  

making enhancements to software products  developing a new software product  correcting problems  adapting products to new environments  

The preliminary design is an internal document used only by programmers  The preliminary design is the result of mapping product requirement into software and hardware functions  The preliminary design of the product comes from the requirement specification  The developers produce the preliminary design by defining the software structure in enough detail to permit coding  

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