• Data reference period
• Geographic localization (NUTS - 2002)
• Education level

• PRIMARY EDUCATION:  This level consists of education provided for children, the customary age of entrance being six years, covering nine-years of full-time schooling. Its educational aim is to prepare all participants for further education, or to provide them with a labour-market relevant qualification. It is divided into three sequential cycles of education of four, two and three years respectively. This education level is universal, compulsory and free of charge.respectively. This education level is universal, compulsory and free of charge.
• EDUCATIONAL INSTITUTION:  Organizational unit that provides one or more education and training offers.
• ENROLLED STUDENT:  See STUDENT
• LEVEL OF EDUCATION:  Level of the education and training system which is structured according to the progression, complexity and specialization of learning, corresponding to each of the following stages: primary education, secondary education, post-secondary non-tertiary education and tertiary education.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

(Regular primary and regular lower secondary education pupils who remain, for reasons of failure or attempt in improving assessment voluntarily, in the same year level/ Pupils enrolled in the regular primary and regular lower secondary education, in that school year)*100