OOAD
Object-oriented analysis and design (OOAD) is a popular technical approach for analyzing, designing an application, system, or business by applying the object-oriented paradigm and visual modeling throughout the development life cycles to foster better stakeholder communication and product quality.
Structured Analysis vs. Object Oriented Analysis
The Structured Analysis/Structured Design (SASD) approach is the traditional approach of software development based upon the waterfall model. The phases of development of a system using SASD are:
- Feasibility Study
- Requirement Analysis and Specification
- System Design
- Implementation
- Post-implementation Review
Now, we will look at the relative advantages and disadvantages of structured analysis approach and object-oriented analysis approach.
Advantages/Disadvantages of Object Oriented Analysis
| Advantages | Disadvantages |
|---|---|
| Focuses on data rather than the procedures as in Structured Analysis. | Functionality is restricted within objects. This may pose a problem for systems which are intrinsically procedural or computational in nature. |
| The principles of encapsulation and data hiding help the developer to develop systems that cannot be tampered by other parts of the system. | It cannot identify which objects would generate an optimal system design. |
| The principles of encapsulation and data hiding help the developer to develop systems that cannot be tampered by other parts of the system. | The object-oriented models do not easily show the communications between the objects in the system. |
| It allows effective management of software complexity by the virtue of modularity. | All the interfaces between the objects cannot be represented in a single diagram. |
| It can be upgraded from small to large systems at a greater ease than in systems following structured analysis. |
Advantages/Disadvantages of Structured Analysis
| Advantages | Disadvantages |
|---|---|
| As it follows a top-down approach in contrast to bottom-up approach of object-oriented analysis, it can be more easily comprehended than OOA. | In traditional structured analysis models, one phase should be completed before the next phase. This poses a problem in design, particularly if errors crop up or requirements change. |
| It is based upon functionality. The overall purpose is identified and then functional decomposition is done for developing the software. The emphasis not only gives a better understanding of the system but also generates more complete systems. | The initial cost of constructing the system is high, since the whole system needs to be designed at once leaving very little option to add functionality later. |
| The specifications in it are written in simple English language, and hence can be more easily analyzed by non-technical personnel. | It does not support reusability of code. So, the time and cost of development is inherently high. |
Read more: http://www.tutorialspoint.com/object_oriented_analysis_design/ooad_object_oriented_analysis.htm
