Percentage of schools without electricity is the share of schools with no access to permanent sources of electrical power, for example grid / mains connection, wind, water, solar, permanently fuel-powered generator, etc.

Percentage of schools without toilets is the share of schools at a given level of education without a pit latrine, an improved pit latrine, a flush toilet, a pour-flush toilet or a composting toilet

Technical / vocational enrolment as a percentage of total secondary enrolment is the percentage of secondary students enrolled in technical / vocational education programmes, including teacher training programmes

Seasonal migrants are persons employed in a State other than their own for part of the year because the work they perform depends on seasonal conditions

The requirement to present a birth certificate in order to enrol in school may be prescribed by local, regional or national law

Pupil / textbook ratio is the average number of pupils for every textbook in schools

Percentage of household expenditure on education is the total average cost per month per family for a student in a school as a percentage of total household expenditure. Examples of educational expenses include: enrolment fees, tuition fees, uniforms, school supplies and educational materials, school meals and school transport and other payments necessary to effectively access education, such as payment for water, security etc.

This indicator measures the number of years of education required for school teachers to meet certification requirements to teach at a given level of education (Source: Audrey Chapman (2007) Development of Indicators for Economic, Social and Cultural Rights: The Rights to Education, Participation in Cultural Life and Access to the Benefits of Science: p.148)

Transparent procedures include, inter alia, publicly available information about the requirements needed to apply for a teaching position for each level of education and the process for selecting the candidates

Pupil / teacher ratio is the number of pupils enrolled at a given level of education divided by the number of teachers at that level (regardless of teaching assignment)