1. RAD Model:
RAD model refers to Rapid Application Development and it is a type of Incremental Model. The components or functions are developed in parallel and it can handle small projects as well as medium projects. In this model, any changes can be made at any stage. It has high productivity due to less number of people.
2. Incremental Model:
Incremental Model is a model of software development where the product is, analyzed, designed, implemented, and tested incrementally until the product is finished. Multiple development cycles take place and these cycles are divided into smaller modules. Generally, working software in an incremental model is produced during the first module Each subsequent release of the module adds function to the previous release. In the incremental model, the process continues till the complete system is achieved.
Difference between RAD Model and Incremental Model :
| S.No. | RAD Model | Incremental Model |
|---|---|---|
| 1. | RAD model is a software development model where by the components or functions are developed in parallel as if they were mini projects. | Incremental Model is a software development model where the product is, analyzed, designed, implemented and tested incrementally until the product is finished. |
| 2. | RAD model requirements and early stage planning is not necessary. | In incremental model requirements and early stage planning is necessary. |
| 3. | The detailed documentation is required but in limited manner. | In the incremental model, there is a minimal but much needed requirement for detailed documentation. |
| 4. | Time boxed release is how requirements are described. | Requirement specification is done in the beginning. |
| 5. | RAD model is used between large and small project. | Incremental model can’t handle large projects. |
| 6. | There is low amount risk in RAD model. | There is also low amount risk in incremental model. |
| 7. | In RAD model small team size is required. | In incremental model large team is not required. |
| 8. | Flexibility to change in RAD model is Easy. | Flexibility to change in incremental model is Easy. |
| 9. | In RAD model overlapping of phases is possible. | In incremental model overlapping of phases is possible. |
| 10. | Testing is done in RAD model after completion of coding. | Testing is done in incremental model after every iteration of phase. |
| 11. | Returning to previous stage/phase in RAD model is possible. | Returning to previous stage/phase in incremental model is possible. |
| 12. | Cost of RAD model is also Low. | Cost of incremental model is also Low. |
| 13. | It provides easy maintenance. | It promotes maintainability. |
| 14. | RAD model has short duration. | Incremental model has very long duration. |
| 15. | It provides reusability. | Reusability is possible to some extent. |
