Skills Development represents the training and education activities of the country and the immediate outputs of that system in terms of the skills developed and attained. Sub-pillars are included to distinguish compulsory education, and other education and training (lifelong learning activities). The basic education sub-pillar comprises 3 indicators to measure quality, participation and achievement in compulsory education: pre-primary pupil-to-teacher ratio; share of population aged 15-64 with at least upper secondary education; and reading, maths & science scores (aged 15). The third indicator corresponds to one if the EU education and training targets for 2020, namely to reduce the underachievement in reading, maths and science below 15%. The training and other education sub-pillar comprises 3 indicators to measure participation and achievement in lifelong learning activities: participation in recent training; participation in VET; and achievement of high computer skills. The first indicator corresponds to one of the EU education and training targets for 2020, namely to reach 15% adult participation in learning. Detailed information on the definitions and the background of these indicators can be found in the Technical Report.