I really, REALLY like these 3 "levels". They map to programming language perfectly (as we'd expect), syntax is encoding, semantics is the logic we think we're going to get (hypothesis, remember it's computer "science"), and the effectiveness is what actually happens. We love computers because they almost always do what we want them to do, but people like to forget that nothing is perfect.

All communication, regardless of with whom or what, is lossy.