The problem of reducing everything to measurements and scales is that you lose the grey areas in-between numerical assignments. You don't look at gradations.
Psychologists evaluate patients based on progress they have made, on changes of perception and action over time. Psychologists take in all factors of the patients' case histories and personalities. The total picture is what they view.
The pollsters and chart-masters think every experience is finite and reducable. They are charting the experience, but they leave out the human factor. Humans are complex, unpredictable creatures. Their likes and dislikes are personal, so they depend on all the quirks and aberrations of personality. Economists are now looking at the human factor when they make predictions. The economy and all social sciences are not extant independent of us. We created them. Human nature is the lynchpin that keeps a product or service connected to our habits.
Don't worry about using that calorie counting machine, though. Your waist line is measurable.
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