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  • If you recognize that realistically/practically you wouldn't implement INotifyDataErrorInfo without INotifyPropertyChanged then your question is a bit moot :). A different specific example might have a different answer (like composition, as you mentioned). Commented Nov 9, 2017 at 13:49
  • Also, coming from a C++ background I can tell you that multiple inheritance winds up being more trouble than it's worth. Commented Nov 9, 2017 at 13:51