Evaluation
Changing subjects a bit to speak about evaluation.
In relation to complex subjects, involving a large number of variables, many of them not well defined, as is the case with education and/or human development, what is important to evaluate is often impossible to evaluate by precise and objective criteria, and what is possible to evaluate by precise and objective criteria is often not so important.
The United Nations Development Program created a Human Development Index (HDI) to help member nations evaluate their status in relation to human development. It is certainly important to evaluate human development at the individual, national and even global level. However, it is not easy to do so. So, indicators are defined that will hopefully allow us to evaluate the status of human development in a nation by precise and objective criteria. The indicators are percentage of children in school, life expectancy at birth and per capita income.
However, what guarantee is there that a larger number of years of schooling correlates positively with more and better learning and education? What guarantee is there that a longer life is a happier life? What guarantee is there that a larger income makes people more humanly developed, helps them actualize their human potentials better?