Help on Number of External Interfaces

How do I fill in Number of External Interfaces?

Number of External Interfaces refers to how many other systems or software that your software will have to interface with. This includes for example a piece of database software, a web-based server, or any other object that your software will have to interface with. From the software you plan to develop, decide how many external objects your software will have to interface with. In addition, try and rate each interface as SIMPLE, AVERAGE, or COMPLEX.

For example, after examining your software you may decide that it will need to have 3 external interface. Out of those 3, you decide that 3 will be simple, none will be average, and none will be complex.