OOAD focuses on analyzing the requirement and designing the model of the system before the coding starts. OOAD is done to ensure the purpose and requirement of the system is captured and documented before the system is built. OOAD consists of two phases.
- Object-oriented Analysis (OOA)
- Object-oriented Design (OOD)
| Object-oriented Analysis (OOA) | Object-oriented Design (OOD) |
| creating a model of a system based on what the user requires of the system | adds detail and design to the model |
| takes a “black box” approach to the system, ignoring the inner working | takes a “white box” approach and makes the decision on how the model will be implemented in the code |
| model is made in user’s perspective | design takes place in developer’s perspective |
| abstracting from the problem domain. primary classes and objects are identified. | new classes are added to provide mechanisms that enable the system to work |
| implementation environment is not considered | implementation environment is considered |
