methods of testing

Black box testing	Grey box testing	White box testing
The internal working of an application is not required to be known.	Limited or partial knowledge	Full knowledge of the application
Performed by end users and also by testers and developers	Performed by end users and also by testers and developers	Performed by developers
This is the least time consuming and exhaustive	partly time-consuming and exhaustive	Most of the time consuming and exhaustive
Testing is based on external expectations-internal behaviour of the application is unknown	Testing is done on the basis of high-level database diagrams and data flow diagram	Internal working are fully known and the tester can design test data accordingly
This can only be done by trial and error method	data domains and internal boundaries can be tested, if they know	data domains and internal boundaries can be tested, if they know
Not suited to algorithm testing	Not suited to algorithm testing	suited for algorithm testing
Testing output, Without knowing the process that led to it	Testing code and output	Testing the code

Advantages and disadvantages of white and black box methods

	Black box testing	White box testing
benefits	*fits big code. *There is no need to access the code. * No need to be a developer or programmer * A clear separation between the user and the developer	*Knowing the code makes better planning of testing *Maximum coverage of test
disadvantage	* Accuracy test damaged due to the poor knowledge that the examiner have * Low coverage. The testing only the black box.	*Sometimes there is no need for going down so deeply *there is no need to qualifications people.