Many countries use occupational classifications, notably the International Standard Classification of Occupations (ISCO), to identify their professional STEM workforce, which comprises Science & Engineering (S&E) professionals and Information & Communication Technology (ICT) professionals. The share of total employment in these roles indicates the extent to which economies create and sustain jobs that require high levels of scientific and technical expertise, often closely linked to research, technological development and innovation. While not all individuals in these occupations are directly engaged in R&D, they contribute to the capacity of economies to develop, adopt, apply and diffuse new knowledge and innovations.
ReICO data, drawn from labour force survey and population census sources, show that together S&E and ICT professionals make up an important share of the workforce across countries, though their size and the relative weight of the two groups vary considerably from country to country.
While standard occupational classifications do not precisely delineate research and innovation roles, they provide valuable insights into how economies deploy both high‑level professionals and technical occupations in activities related to the production, application and diffusion of knowledge. Taken together, the shares of professionals and technicians in total employment help capture the broader skills base underpinning innovation systems, highlighting countries’ capacity to support both advanced expertise and its practical implementation.