1.Boundary value analysis(BVA)and
2.Equilance class partition(ECP)

1. Boundary value analysis
2. Equivalance class partition
3. Error guessing

HI
    1. Boundary value analysis

       (The Input Stream is Divided into diff classes
        Like Numerical, Alphabetical, Alpha-Numerical,
             IF required Special char's).

    2. Equivalence Partitioning
       
       ( Here The Inputs Are Tested with Boundary Conditions
         say Max 4 chars &
             Min 1 char
             Then the Boundary Condition will be
             UPPER LIMIT       N = 4+1 & N = 4-1 
             LOWER LIMIT       N = 1+1 & N = 0 
                               (i.e N = 0 is Null value).
  Error guessing
   
            Check The application with Random Inputs.

 sun_ramprasad@yahoo.com

hi friends 
either one technique or all three should follow?

Hi all

Actually each one of you have mentioned black box testing
techniques.The testing techniques which we'll follow for
writing test cases will depend upon what technique we have
adopted.1)Black Box 2 )White Box.

If we'r following black box then below are choices for that.

1)Equivalence partitioning
2)Boundary value analysis
3)State transition
4)Decision tables
5)Use case testing.

For white box testing we'll follow below methods.

1)Statement coverage.
2)Path coverage
3)Decision coverage
4)Data flow.