1. V 型：
V模型是软件测试过程中最重要的模型。它也被称为验证和验证模型。它是由已故的 Paul Rook 在 1980 年代引入的。 V 模型是一个顺序过程，其中只有在当前阶段完成后才开始下一阶段。在此模型中，当台阶向上弯曲时，台阶不会以线性方式移动。
2.增量模型：
增量模型是一种软件开发模型，在该模型中，产品以增量方式进行分析、设计、实施和测试，直到产品完成。发生多个开发周期，这些周期被划分为更小的模块。通常，增量模型中的工作软件是在第一个模块期间生成的。该模块的每个后续版本都会在先前版本的基础上增加函数。在增量模型中，过程一直持续到实现完整的系统。
V模型和增量模型的区别：
| S.No. | V MODEL | INCREMENTAL MODEL |
|---|---|---|
| 1. | V model is software development model but development and testing are not concurrent. | Incremental Model is a software development model where the product is, analyzed, designed, implemented and tested incrementally until the product is finished. |
| 2. | In V-model testing activities start with the first stage. | Testing is done in incremental model after every iteration of phase. |
| 3. | Flexibility of V-model is Little flexible. | Flexibility to change in incremental model is Easy. |
| 4. | Cost of V-model is expensive. | Cost of incremental model is also Low. |
| 5. | Guarantee of success through V-model is high. | Guarantee of success through Waterfall model is low. |
| 6. | In this user involvement is also only in beginning. | In this user Involvement is only at the beginning. |
| 7. | It is not iterative. | It is iterative. |