Unit 5.1 - Key termsThe Human Development Index (HDI) is a composite indicator of human development by measuring three key dimensions: (i) life expectancy, i.e., a long and healthy life, (ii) eduction, i.e., access to knowledge, and (iii) real GDP, i.e., income to sustain a decent standard of living.Human freedom refers to the notion that individuals can lead a dignified life without coercive constraints imposed on them.