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Message: [QUOTE="Sohum, post: 7187330"] First of all, it is the same Sohum (I don't know why OE uses my spymac address) Mattias Sjögren wrote: This doesn't work, because I need to accept an Interface which encompasses both in a method. I can't exactly write this: Public Sub AcceptsInterface(A as MyInterface+MyInternalInterface) now can I? Branco Medeiros wrote: <snip> So what happens here when I define a method in another class in this assembly that needs to accept the interface, and needs to use Property X? If Public Sub AcceptsInterface(A as A) .... = DirectCast(A,B) then they can inherit A and create other interfaces and pass them to this function, and the Directcast crashes. I could add error handling, but I would prefer to not let them inherit in the first place (less ugly). But I can't mark it NotInheritable because I've already inherit from it! And I can't write Public Sub AcceptsInterface(B as B) because B is friend. Is there any way to de-uglify the solution? Sohum [/QUOTE]