Answer / kavitha mattewada

The Black Box techniques are
1.Boundary Value Analysis(BVA)
2.Eqivalence class partitions(ECP)
3.Decision Table(DT) and
4.State Transition Diagram(STD)

Answer / rahul

black box testing techniques based on external
specification without of how the system is constructed.

black box Testing Strategies/Techniques

1. black box testing should make use of randomly generated
inputs (only a test range should be specified by the
tester), to eliminate any guess work by the tester as to
the methods of the function
2. data outside of the specified input range should be
tested to check the robustness of the program
3. boundary cases should be tested (top and bottom of
specified range) to make sure the highest and lowest
allowable inputs produce proper output
4. the number zero should be tested when numerical data is
to be input
4.stress testing should be performed (try to overload the
program with inputs to see where it reaches its maximum
capacity), especially with real time systems
5. crash testing should be performed to see what it takes
to bring the system down
6. test monitoring tools should be used whenever possible
to track which tests have already been performed and the
outputs of these tests to avoid repetition and to aid in
the software maintenance
7. other functional testing techniques include: transaction
testing, syntax testing, domain testing, logic testing, and
state testing.
8.finite state machine models can be used as a guide to
design functional tests

Answer / ch.s.m.prasad

B.V.A (Boundary Value Analysis)

E.C.P( Equallence Class Partition)

Error Guessing

Answer / rudraneel

Black Box Design Techniques :

1. B.V.A(Boundary Value Analisys)

Input values of the boundaries of input domain are tested.

Example :
An inventory raises from 10,000 unit to 20,000 unit.
If A is valid boundary of 10,000 and B is valid boundary of
20,000 then invalid boundary of A is A-1 and same for B is
B-1.

Then Valid Boundary values are : 10,000(A) and 20,000(B)
and Invalid Bounadry values are 9,999(A-1) and 19,999(B-1).

Advantages :
i)Small set of inputs
ii)Very clear guideline for choosing inputs

Disadvantages :
i)Doesn't combine all possible set of inputs.

2. E.C.P(Equivalence Class Partitioning)

Same types of inputs will be placed in same class;

Example:
For above example
Valid Class for A & B
Invalid Class for A-1 & B-1

Advantages :
i)Minimizes set of inputs
Disadvantages :
i) No guide line for choosing inputs
ii)Doesn't combine all possible inputs

Error Guessing

An informal technique where experienced tester apply his or
her logic to find out defects after when a lot of formal
techniques have applied already.

2. If you had to give the site a grade, from A to F, where A was exemplary and F was failing, what grade would you give it, and why?

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Hi All, I am new in testing field. I got an interview and the question was asked- What would be your high level test case on the following scenario. There are 2 fields one is SCORE and other is GRADE and there is a go button. Scenario is If score is 90- 100 then grade should be A, if Score is 80-90 then B, if 70- 80 then C Else F. So I told that - I will check Boundary values by giving max +1 and min-1 values. I will check the functionality is working as per the requirement or not. I will include + and - testing. But seems like my answer was not correct, obviously because I don't have much experience. So plz provide me the best answer of this Q ? Thanks in advance. Preeti

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