we can parameterize data in three ways
in parameter and out parameter which is used with called 
tests
the other one keyboard view
the third one is testdata in script

Parameteriztion can be possible in the fallowing ways
1:Action or test or component parameters
2:Environment Variables
3:DataTable
4Random numbers

Parameterization can be possible in the following ways
1:local data sheet
2:Environment Variables
3:DataTable
4Random Variables

MAy be another one way (QTP 9.0)
File->settings->parameter by passing input parameter

In three ways we can parameterize the data in QTP
the first way is using Data Driven
Second way is using Keyword View
the third way is by directly give the variable names

parameterize three ways in qtp
1.keywordview
2.experview(parameterisation)
3.manually scripting


1.expertview(parameterisation):
              any application open for example calculator
and recording that application 
vbwindow("form1").activate
vbwindow("form1").vbedit("value1").set "10"
vbwindow("form1").vbedit("value2").set "20"
vbwindow("form1").vbbutton("add").click
         data table as import or automatically created
v1  v2 ev
10 20  30
20 30 50
30 40 70  datatable to be created
         in tools option datadriver(no recording script 
datadriver is disable and recording script data driver is 
enable)
          datadriver is selected after (for example

10   1   0) go parameterise and select parameterise option 
and select  v1 click on ok button first v1 is parameterised
(parameterise means 1 value changed in 0 and 0 value 
changed in 1) and same as v2
      finally click on recording as go to checkpoint and 
select standard check point click on result and to go 
parameterise and parameterise options select ev click on ok 
button
(second recording in checkpoint in result in script as 
beging cursor checkpoint as begining statement but finally 
datatable  3 lines created first line will be correct ,2nd 
and 3rd line will be error.
        but cusor will be ending means 2nd recording as 
chekpoint and select standard checkpoint selecting result 
option "vbwindow("form1").check checkpoint("result")"
this statement as ending data table in 3 lines are passed
and result willbe passed

(this is one type of method)

         vbwindow("form1").vbedit("value1").set datatable
("v1",dbglobalsheet)
vbwindow("form1").vbedit("value2").set datatable
("v2",dbglobalsheet)
                 global sheet means in qtp datatable in 
first in globalsheet (dbglobalsheet=1)
vbwindow("form1").check checkpoint("res")
  

           vbwindow("form1").vbedit("value1").set datatable
("v1",1)
       vbwindow("form1").vbedit("value2").set datatable
("v2",1)

                 datatable("v1",1) as given in a
                 datatable("v2",2) as given in b


              MANAUAL SCRIPT IN PARAMETERISATION
 a=datatable("v1",1)
vbwindow("form1").vbedit("value1").set a
b=datatable("v2",1)
vbwindow("form1").vbedit("value2").set b
vbwindow("form1").check checkpoint("res") IN THIS statement 
begining datatable in 3 lines 1 line pass 2nd and 3rd line 
failed  
     ending three lines will be passed