Good Case For Interfaces

Question

I work at a company where some require justification for the use of an Interface in our code (Visual Studio C# 3.5).

I would like to ask for an Iron Clad reasoning t

Answer 1

• You can implement multiple interfaces. You cannot inherit from multiple classes.
• ..that's it. The points others are making about code decoupling and test-driven development don't get to the crux of the matter because you can do those things with abstract classes too.