Such correlations are, of course, an indication that further research is required on the importance of labour in the manufacturing and operating costs of renewables. As shown in this table, most of the positions (46% of the occupations identified) require an apprenticeship, generally available through craft unions, 31% of the positions require graduation from high school, and 23% require some form of college degree, and 7% require an engineering degree. While not comparable to the operation of NPPs (it would be comparable to a module fabrication factory for a small modular reactor (SMR), however there is little publicly available information on the organisation of an SMR factory, see EPI, 2010: p. 28), the number of engineers required to produce wind turbines is far below the number required to produce and operate nuclear reactors, although it is similar to the number of engineers required to operate a waste management facility (NEA, forthcoming: p. 79).