what functions should I include in my application?

Question

I want to define a time attendance system for government, and right now I am preparing a system requirement document, can someone give me some advices about what features/functions should I include in the system ?

Answer 1

public int MeaningOfLife
{
    get
    {
        return 42;
    }
}

Charge for anything beyond that.

Answer 2

The ones that your customer asks for... not the ones that stackoverflow users might suggest :)