The skills pillar provides a comprehensive list of knowledge, skills and competences relevant to the European labour market. In ESCO v1.1.2, the skills pillar is structured in a hierarchy which contains the following four sub-classifications: 

The ESCO occupations pillar is built on ISCO-08 which serves as the hierarchical structure for the occupations pillar. ISCO-08 provides the top four levels for the occupations pillar and ESCO occupations are located at level 5 and lower. In ESCO, each occupation is mapped to exactly one ISCO-08 code.  Any occupation concept relevant to the European labor market is allocated within this hierarchy.