Advantages of Black Box testing

 Advantages of black box testing -   
  Following are the different advantages of black box testing -
•    more effective on larger units of code than glass box testing.
•    tester needs no knowledge of implementation, including specific programming languages.
•    tester and programmer are independent of each other.
•    tests are done from a user's point of view.
•    will help to expose any ambiguities or inconsistencies in the specifications.
•    test cases can be designed as soon as the specifications are complete.
     Disadvantages of Black Box Testing -
•    only a small number of possible inputs can actually be tested, to test every possible input stream would take nearly forever.
•    without clear and concise specifications, test cases are hard to design.
•    there may be unnecessary repetition of test inputs if the tester is not informed of test cases the programmer has  already    tried.
•    may leave many program paths untested.
•    cannot be directed toward specific segments of code which may be very complex (and therefore more error prone).
•    most testing related research has been directed toward glass box testing.

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