Functional point analysys is a concept of finding out estimates in terms of points. It is one of the best practise of finding out estimates irespective of any technology dependancy.
FPA is divided into 4 attributes. All these 4 Attributes are nothing but functional key ares of transcation.
For Example:
1. Input
2. OutPut
3. Input External Data
4. Output Internal Data

*Query data is not considered as FPA points.

Regards
Shabeeh Siddiqui