"The lesson here is that “meaning” and “information” are distinct concepts. Meaning is something which can’t be quantified, whereas information can. Meaning is subjective, information is objective. So how do you quantify information? In bits.

[...]

Efficiency doesn’t let you know how fast an interface is, or how often people will make mistakes, or how hard your interface is to learn. Efficiency doesn’t quantify beauty (although is something of a proxy to elegance). The humaneness of an interface simply cannot be reduced to a single number: sometimes highly efficient interfaces can be entirely inhumane. But even a full battery of GOMs modeling, focus groups, and user testing can only show you the mistakes of your current design.

Efficiency can tell you when you need a new inspiration."