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    Out of all the answers, this one gives the best mixture of brevity without loss of clarity Commented Apr 17, 2014 at 8:16
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    Someone once told me to use an interface when there is a "has-a" relation. I'm not sure if that's always true though; My laptop has a screen, so should laptop implement IScreen, or have a Screen property? The latter seems more natural to me. Commented Oct 30, 2014 at 12:47
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    @berend funny that you write that because the screens are implemented via interfaces - VGA, HDMI etc Commented Dec 16, 2014 at 20:32