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First Generation Development Techniques
Second Generation Development Techniques
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activities analyzed approach arrows automated benefits COBOL CODASYL complete concepts cost cycle data base data flow data flow diagram data processing data structure decision Decision table defined definition phase detailed documentation environment errors evaluation example executive flow chart formation function gram hierarchical HIPO identification phase identified implementation improvement information systems input interface inventory language logical major mation ment methodology modified module needs objectives ONVS operational organization output performance PLEXSYS problem statement proc procedures produce PSL/PSA punched card quirements reduced relationships Requirements Engineering REVS SADT shown in Figure Software Engineering software maintenance software requirements specific SREM structure chart structured programming study team subsystems system development systems design systems plan techniques tems tion update Warnier Diagram