OBJECT ORIENTED ANALYSIS AND DESIGN

            Object oriented system development methodology

o   OOSD methodology is based on functions and procedures.

o   OOSD is the way to develop software by building self contained modules or objects that can be easily,

§  Replaced

§  Modified

§  Reused.

o   In an object-oriented system, everything is an object: numbers, arrays, records, fields, files, forms, an invoice, etc.

o   An Object is anything, real or abstract, about which we store data and those methods that manipulate the data.

o   Conceptually, each object is responsible for itself.

§  Eg 1. A chart object is responsible for things like maintaining its data and labels, and even for drawing itself.

§  Eg 2. A window object is responsible for things like opening, sizing, and closing itself.