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Modernizing Legacy Systems: Software Technologies, Engineering Processes, and Business Practices by Grace A. Lewis, Daniel Plakosh, Robert C. Seacord

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Chapter 5. Understanding the Legacy System

Understanding the Legacy System

with Dennis Smith and Liam O'Brien

Dennis Smith and Liam O'Brien are senior members of the technical staff at the Software Engineering Institute at Carnegie Mellon University.

 

It is quite true what Philosophy says: that Life must be understood backwards. But that makes one forget the other saying: that it must be lived forwards.

 
 --Soren Kierkegaard (1813-1855),Journal entry, 1843.The Diary of Soren Kierkegaard, pt. 5, sct. 4, no. 136, ed. Peter Rohde (1960).

Studies estimate that between 50 percent and 90 percent of software maintenance involves developing an understanding of the software being maintained ...

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