severity describes seriousness of the defect with respect to functionality where priority describes importance of defect to solve with respect to customer.
Example:

Suppose we identify two bugs

-The client logo is not appearing on the web site but the site is working fine... in this case the severity is low but the priority is high because from company's reputation it is most imp to resolve. After all the reputation wins more clients and projects and hence increases revinue

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Automation is chosen when

-A same set of tests need to be repeated again and again

-When a single test needs to be repeated for a large number of data

-When stable modules needs to be regressed frequently.

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A bug leakage results when a bug is detected which should have been detected in earlier builds/versions of the application.

A defect which exists during testing yet unfound by the tester which is eventually found by the tester/end-user is also called bug leakage.

A bug release is when a particular version of s/w is released with a set of known bug(s)/defect(s). These bugs are usually low severity and/or low priority bugs. It is done when the company can afford the existence of bug in the released s/w rather than the time/cost for fixing it in that particular version. These bugs are usually mentioned in the Release Notes.

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I have used following 4 types of Methodologies:

1. Boundary value analysis

2. Equivalence partitioning

3. Error guessing

4. Cause effect graphing

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Glass Box (or white box) testing is the process of giving i/p to the system and checking how the system processes i/p to generate o/p

Black Box testing is the process of giving i/p to the system and checking if the system is giving correct o/p without bothering how the o/p is generated.

As we can see from the definitions, the role of black box testing is to ensure that the o/p generated is correct. And role of white box testing is to ensure that methods used to generate the o/p are correct.

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