Data Driven Testing it is a retesting process of software 
using an automation tool.
It is simply called as DDT.
In this we will check the software with different inputs to
test its behavior in a comprehensive way.

Here in this data driven testing as i told above we use 
automation  tool to check with different inputs.
For this first we need to generate a test script
     We can generate this test script in two ways
        1.Recording Method
        2.Descriptive Programing method
IF you  are begginer,then no way you will go for recording
Method ofr script generation.
After recording we will convert it into datadriven test.
here the conversion process depends on tool.
It is very easy converting a normal test into Data Driven 
Test using  QTP.Bocoz it has built in Excel sheet.
somewhat complex but not difficult using WinRunner in 
coversion  process of ordinary test into Data Driven Test.
it needs a little bit practice and you sholud follow some 
procedure.
if u come for Descriptive Programming (simply DP)u should 
have some knowledge on Test Script Language(TSL)or one of 
VB Script or Java Script langauge.
  If we use WinRunner
           TSL- Test Script we use or 
  If we use Quick Test pro(QTP) we use
           VB Script or Java script  
  Most of the prople use VB script for DP.

In a Nutshell i will explan finally about DDT:

  1.Generate the test script using Recording method or
    using DP.
  2.Parameterise the test script.
  3.Provide the required data.
  4.Run the test script.
"Data driven test means different sets of data will drive 
the test to know the software behevior."

Byee 
friendz
rajendra
Rajendra_penumalli@yahoo.com
+919885262742
Hyderabad