“They almost never credibly analyze their implementations.
However, with the rise of interaction design and information architecture, and the overt intention of delighting end users even while making their lives easier, the design community has continued their push into the experience domain. Over decades, without a credible basis for defining or measuring the whole of human experience, they have garnered an astounding quantity of successes.
One could conclude that success in this domain requires only the ability to innovate or to follow strategically, and the ability to deliver user-perceptible value. Which is another view of science: that quantification merely follows, but that science (especially the social sciences) proceeds through innovation and serendipity in theory and application, and by the delivery of ultimate value. Decided:
Abandon quantification; and may the fittest win.”
Evaluating systems after they have been built is important, but is almost never done. It is a business problem: it isn’t being done because it’s hard to sell. The main value of developing a business model where you can sell that research-after-the-fact lies in the increased experience it creates for the implementors: they can then find mistakes faster and thus learn from them faster.