| 1 |
The basic abstraction are real world functions such as sort, display, track, etc. |
The basic abstraction are not real world functions such as sort, display, track, etc.., but real-world entities such as employee, picture, machine, radar system, etc. |
| 2 |
For example, an employee pay-roll software is developed by designing functions such as update-employee record, get-employee-address, etc. |
In object-oriented-design, an employee pay-roll software is developed by designing objects such as employees, departments, etc. |
| 3 |
State information is represented in a centralized shared memory |
State information is distributed among the objects of the system. |
| 4 |
For example, while developing an employee pay-roll system, the employee data such as the names of the employees, their code numbers, basic salaries, etc. are usually implemented as global data in a traditional programming system. |
Whereas in an object-oriented system these data are distributed among different employee objects of the system. |
| 5 |
Somewhere or the other the real-world functions must be implemented. |
Objects communicate by passing messages. Therefore, one object may discover the state information of another object by interrogating it |
| 6 |
Function-oriented techniques such as SA/SD group functions together if, as a group, they constitute a higher-level function |
On the other hand, object-oriented techniques group functions together on the basis of the data they operate on. |
