CSC 480Software Engineering

Lecture 2

The Four P’s

The four P’s in software development People – in different roles working in a team Product – the working software system and

associated artifacts Process – a set of activities that is performed in a

certain order toward a special purpose Project – a specific instance of building a software

product

Structured Programming

Use control constructs, avoid using gotoA hierarchy of functions, with those in higher

levels calling those at lower levelsModules tend to couple with each other,

making change difficult

Illustration – Structured Programming

1GL & Early 2GL

Object-Orientation

Encapsulate data and functionality in objectsMapping to real-world entities

Both congregation and inheritance hierarchies

Easier to modify and add components

Illustration – Object Orientation

Class & Object Hierarchies

Small Applications Using OOPL

Large Applications Using OOPL

Reuse & Components

Reuse can reduce cost and improve quality

Reuse at component level is more effective

COM JavaBeans

Example – a JClass chart by sitraka.com