Hi Bonnie, I've been following this thread and thought I'd throw this into the arena, is the following interface inheritance "the done thing" when designing interfaces ? ( code copied from your example )

public class LivingThings
{
    public virtual void FeedMe()
    { 
        
    }
    
}

public interface ICircus
{
    void PerformTricks();
    void TalkToMe();
}
public interface IFarm : ICircus
{
    void EatMe();
   
}
public class TrickGoats : LivingThings,IFarm
{
    public override void FeedMe()
    {

    }

    public void PerformTricks() { } 
    public void TalkToMe() { }
    public void EatMe() { }
}

many thanks in advance