Standard data types that are included with Rational Test. 
These data typesinclude commonly used, realistic sets of 
data in categories such as first and lastnames, company 
names, cities, and numbers.
For a list of the standard data types, see Appendix C.

User-defined data types that you create. You must create a 
data type if none of
the standard data types contains the kind of values you 
want to supply to a script
variable.

the purpose of the break point is used to moniter the
watchlist variables,expressions values

we will debug the script in 3 ways
1 by inserting break points
2 by adding watch points
3 by executing step by step

and also run the script in debug mode