“Best Practice” replaced by
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“Best Practice” |
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Program Design (1970-Present) flow charts top-down “stepwise refinement” (Edsger Dijkstra, Niklaus Wirth);
modular programming (David Parnas) |
JSP tree diagrams “constructive design” - composition of
input and output models; each step is constructed using guidelines that
enable designer to verify correctness |
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System
Development (1970-Present) top-down hierarchic decomposition; a system is a hierarchy of functions (IBM’s HIPO) |
JSD entity-based design; system a network of
communicating sequential processes, one process for each entity |
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OOAD
(1987-Present) solution-based ·
use case analysis
- at the interface of the machine with the real world ·
O-O paradigm,
a formal programming paradigm ·
UML Most SE deals with solution design; PF is
a counterweight to this tendency |
Problem
Frames focus on problems - description of problem domain, requirements, and specification;
separation of problem from solution (separation of concerns) ·
problems are
located in application domain, further away from the machine ·
real world is
an informal domain; must “bridge
the gap” between the requirement and the machine specification |