Below are some of the situations when Descriptive 
Programming can be considered useful: 
1.	The objects in the application are dynamic in 
nature and need special handling to identify the object. 
The best example would be of clicking a link which changes 
according to the user of the application, Ex. “Logout 
<<UserName>>”.
2.	When object repository is getting huge due to the 
no. of objects being added. If the size of Object 
repository increases too much then it decreases the 
performance of QTP while recognizing a object.
3.	When you don’t want to use object repository at 
all. Well the first question would be why not Object 
repository? Consider the following scenario which would 
help understand why not Object repository

Scenario 1: Suppose we have a web application that has not 
been developed yet. Now QTP for recording the script and 
adding the objects to repository needs the application to 
be up, that would mean waiting for the application to be 
deployed before we can start of with making QTP scripts. 
But if we know the descriptions of the objects that will be 
created then we can still start off with the script writing 
for testing

Scenario 2: Suppose an application has 3 navigation buttons 
on each and every page. Let the buttons be “Cancel”, “Back” 
and “Next”. Now recording action on these buttons would add 
3 objects per page in the repository. For a 10 page flow 
this would mean 30 objects which could have been 
represented just by using 3 objects. So instead of adding 
these 30 objects to the repository we can just write 3 
descriptions for the object and use it on any page.

4.	Modification to a test case is needed but the 
Object repository for the same is Read only or in shared 
mode i.e. changes may affect other scripts as well. 
5.	When you want to take action on similar type of 
object i.e. suppose we have 20 textboxes on the page and 
there names are in the form txt_1, txt_2, txt_3 and so on. 
Now adding all 20 the Object repository would not be a good 
programming approach.

if one describes the object description in the pgm itself 
that is desc pgmming