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. 螺旋模型：
螺旋模型是一种软件开发生命周期模型，高度用于风险驱动模型。基于给定项目的风险模式，螺旋模型帮助开发人员提高模型的效率，因为大多数风险已经处理。它由许多形成螺旋形状的循环组成，其中每个循环称为软件开发周期的阶段。
V型和螺旋型的区别：
| S.No. | V MODEL | SPIRAL MODEL |
|---|---|---|
| 1. | V model is software development model but development and testing are not concurrent. | Spiral model is a software development model and is made with features of incremental, waterfall or evolutionary prototyping models. |
| 2. | In V-model testing activities start with the first stage. | Testing is done in spiral model at the end of the engineering phase. |
| 3. | Cost of V-model is expensive. | While cost of spiral model is also very expensive. |
| 4. | Flexibility of V-model is Little flexible. | Flexibility to change in spiral model is not that difficult. |
| 5. | Guarantee of success through V-model is high. | Guarantee of success through Spiral model is low. |
| 6. | User involvement in V-model is also only in beginning. | In this user Involvement is only at the beginning. |
| 7. | It is not iterative. | It is iterative. |