You can use
**Function Point Modeler**
to define the sub estimation of each subsystem and to quantify each subsystem separately by using
**COCOMO**
cost factor.
You can also use
**Function Point Modeler**
to define some factors for whole project by using
**COCOMO**
scale factor.
Your project might contain two application systems, one of them is system A based on the
**J2EE**
and other is system B based
**SAP**
. You have to estimate your project as a whole.
You can define the
**COCOMO**
cost factor in the CocomoBase estimation for whole project. You might create two CocomoSub estimation for the system A and system B.

You'll define sub estimations, assign
**COCOMO**
cost factor values of each sub estimation, etc. The sum of the CocomoSub estimations is the total project estimation.

*CocomoBase*