Object Oriented Analysis and Design


Object Modeling Concepts

Most of the methods used in software development houses are based on a functional and/or data-driven decomposition of the systems. These approaches differ in many ways from the approaches taken by object-oriented methods where data and functions are highly integrated. Object-oriented systems development is a way to develop software by building self-contained modules or objects that can be easily replaced, modified and reused. It depicts the view of real world as a system of cooperative and collaborative objects. In this, software is a collection of discrete objects that encapsulates data and operations performed on that data to model real world objects. A class describes a group of objects having similar structures and similar operations
Object Oriented Philosophy is very much similar to real world and hence is gaining popularity as the systems here are seen as a set of interacting objects as in the real world. To implement this concept, the process-based structural programming is not used; instead objects are created using data structures. Just as every programming language provides various data types and various variables of that type can be created, similarly, in case of objects certain data types are predefined.

modeling

A model is an abstraction of something for the purpose of understanding it before building it. Because, real systems that we want to study are generally very complex. In order to understand the real system, we have to simplify the system. So a model is an abstraction that hides the non-essential characteristics of a system and highlights those characteristics, which are pertinent to understand it. The characteristics of simplification and representation are difficult to achieve in the real world, since they frequently contradict each other. Thus modeling enables us to cope with the complexity of a system.

Object Modeling Technique


The Object Modeling Technique (OMT) is an object-oriented analysis, design, and implementation methodology that focuses creating a model of objects from the real world and then using this model to develop object-oriented software. OMT was developed by James Rumbaugh. The OMT methodology uses three kinds of models to describe a system:
1. Object model - describes the objects in the system and their relationships; 2. Dynamic model - describes the interactions among objects in the system; and 3. Functional model - describes the data transformations of the system.

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