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When to STOP the testing in Manual and Automation?
Below are the 4 condition when we stop the testing manual and automation testing:-
(1)Once testing deadline is met and there is no high priority issues left in the system.
(2)We can stop testing when we complete cycle of test cases after the last known BUG fix with agreed upon value of pass-percentage.
(3)If MTBF (Mean Time Between Failure) is quite large ONE can stop the testing PHASE. And MTBF is the time interval between two inherent failures.
(4)We can stop testing when automated code coverage REACHES specific threshold with a specific pass-percentage with no critical bug.

How to be good Manual Software TESTER
Some people think that we need some special skillset for Manual Software TESTING. Which is not 100% true. We need some skillset on some extent. For Manual Software Testing we have to develop and enhance our thought process. And we cannot buy this in some few buks. we have to devlop this by our own.
And we need to add some other things also as given below
(1)We need to add a habit of asking questions at every minute while doing on testing.
(2)And tester must ask questions to themself to improve ourself.

Below diagram will help US to under stand the Manual Software Testing. And content with extra circle have most important.

Difference between TDD, BDD and ATDD?
These are 3 different TESTING techniques methods. This will helps to CLARIFY all ASPECTS.

Do you have some idea about the DDP in software testing?
DDP full FORM is Defect detection percentage. And DDP is a type of testing metric. Here we will find the RATIO of defects before release and after the release and this will indicates the effectiveness of testing Process. To UNDERSTAND this we will take a simple example of this.
Let suppose our QA has detected 60 defects during the testing CYCLE. And customer has added 10 more after the release then DDP would be :-
60/(60+10)=85%

Why we use end to end TESTING?
End-to-end testing is one of the manual testing strategy. And in this testing strategy we EXECUTE tests which will cover every possible flow of out application from starts to finish. And the main OBJECTIVE of performing end-to-end tests is to FIND the software dependencies and assert correct input is passed between different software modules and sub SYSTEMS.