The skills aggregates indicators based on: 1) mean years of schooling, 2) extent of staff training, 3) quality of vocational training, 4) skillset of graduates, 5) digital skills among population, 6) ease of finding skilled employees, 7) school life expectancy, 8) critical thinking in teaching, and 9) pupil-to-teacher ratio in primary education. This is a Composite index (i.e. aggregating multiple sources)