Subject: Object Oriented Modeling and Design

Difficulty: Medium

Marks: 4 Marks

Principles of modeling are as follows:

1. “The choice of what models to create has a profound influence on how a problem is attacked and how a solution is shaped”. This means choose your correct model as per the requirement of problem statement. Wrong model will mislead you, causing to focus on irrelevant issues.

2. “Every model may be expressed at different levels of precision:” This means all the user and developers both may visualize a system at different levels of details at different time.

3. “The best models are connected to reality”. This means that the model must have things that are practically possible. They must satisfy the real word scenarios.

4. “No single model is sufficient. Every nontrivial system is best approached through a small set of nearly independent models:” This means you need to have use case view, design view, process view, implementation view and development view. Each of these views may have structural as well as behavioral aspects. Together these views represent a system.