Difference between Prototype Model and Spiral Model

1. Prototype Model :
Prototype Model is a software development life cycle model which is used when the customer is not known completely about how the end product should be and its requirements. So in this model, a prototype of the end product is first developed by the developers and then tested and changes were made as per customer feedback until the customer is satisfied with the prototype.

2. Spiral Model :
Spiral Model is a software development life cycle model which is highly used for risk driven models. Based on the risk patterns of a given project, the spiral model helps developers to increase the efficiency of model as most risk already handled. It consist of number of loops which are forming a spiral shape where each loop is called phase of software development cycle.

Difference between Spiral Model and Prototype Model :

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.

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