Entry:

Ganzeboom, Harry B.G.; De Graaf, Paul M.; and Treiman, Donald J., “A Standard International Socio-Economic Index of Occupational Status,” Social Science Research, 21 (1992), 1-56

Abstract:

Occupation and education measures can be compared if occupation codes are standardized by ISCO codes and education codes are measured in minimum number of years needed to obtain a certain level of education.