“…• the number of employees, which is considered in the literature to be the most valid indicator of the size of an enterprise (SCHERER, 1992); • expenditure for in-house research and development, the primary index of investment in scientific and technological advance (DE MARCHI & ROCCHI, 1999), (SCHERER, 1992); • expenditure for basic research, which, according to the development of the absorption approach (COHEN & LEVINTHAL, 1989) proposed by ROSENBERG (1990) is a particularly significant indicator of the effort sustained by enterprises to monitor external scientific and technological knowledge;…”