Water Fall model

Water Fall model is one of the famous Software Development Process Model. This Model is used when the Customer is very much clear with the requirements.This Model is also called as a Sequential Model.

Levels of Testing:

There are five levels of Testing.
1. Unit Level Testing
2. Module Level Testing
3. Integration Testing
4. System Testing
5. User Acceptance Testing (UAT)

Unit Level Testing: If one performs Testing on the smallest part of an Application (units) then that level of testing is known as User Acceptance Testing, it is White box Testing and usually done by the Developers (or) White box Testers.

Module Level Testing: If one performs Testing on a Module then it is known as Module Level Testing, it is a Black box Testing and usually done by the Test Engineers.

Integration Testing: Once the modules are ready the developers will combine these modules with some programs (links) and test weather the modules are integrated properly or not, it falls under White box Testing. Usually it is done by Developers or White box Testers.

Integrating the Modules can be done in Four Approaches
1. Top – Down Approach.
2. Bottom – Up Approach.
3. Sand – Witch Approach / Hybrid Approach.
4. Big bang Approach.

System Level Testing: If one performs testing an Application after installing (deploying) it in to an environment is known as “System Level Testing”, it is Black box Testing usually done by the Test – Engineers.(System Integration Testing).

User Acceptance Testing: If the same System testing is done in the presence of user then it is known as “User Acceptance Testing”. It is a Black box Testing.