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Answer Posted / 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.
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