In this kind stuff, there is positive psychology:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Positive_psychology#Happiness_measurement" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Positive_psychology#Happiness_...</a><p>Human sciences lack of a shared model (like in physics). Most studies remain separated and become dead branches. It&#x27;s a bit sad.