Follow information through the system
The IPO model becomes more useful when storage and feedback are included.
Course-registration example
| Stage | Example |
|---|---|
| Input | A student selects a course. |
| Processing | The system checks prerequisites and available capacity. |
| Storage | The registration record is saved. |
| Output | An updated timetable or error message is displayed. |
| Feedback | The student confirms the result or corrects the selection. |
Think in relationships
Each stage depends on the others. Incorrect input, unavailable storage or delayed feedback can prevent the entire service from meeting its purpose.