1.原型模型：
原型模型是一种软件开发生命周期模型，当客户不完全了解最终产品应该如何及其需求时使用。因此，在此模型中，最终产品的原型首先由开发人员开发，然后根据客户反馈进行测试和更改，直到客户对原型感到满意为止。 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。
螺旋模型和原型模型的区别：
| S.No. | Prototype Model | Spiral Model |
|---|---|---|
| 1. | Prototype model is a software development model in which a prototype is built, tested and then refined as per customer needs. | Spiral model is a risk-driven software development model and is made with features of incremental, waterfall or evolutionary prototyping models. |
| 2. | It is also referred to as rapid or closed ended prototype. | It is also referred to as meta model. |
| 3. | It does not give emphasis on risk analysis. | It takes special care about risk analysis and alternative solution is undertaken. |
| 4. | In prototype model, customer interaction is continuous until the final prototype is approved. | In spiral model, there is no continuous customer interaction. |
| 5. | It is best suited when the requirement of the client is not clear and supposed to be changed. | It is best suited when the customer requirements are clear. |
| 6. | Cost effective quality improvement is very much possible. | Cost effective quality improvement is not possible. |
| 7. | In Prototype model, improvement of quality does not increases the cost of product. | In Spiral model, improvement of quality can increase the cost of product. |