 Wright’s earliest attempts to operationalise this increasingly differentiated account of the class structure of contemporary capitalism focuses on whether individuals are self-employed, and whether they supervise the labour of others. This resulted in a simplified typology which added “managers” to the three original Marxist classes (capitalists, petit-bourgeoisie, and proletariat). His subsequent work further differentiated these new social groups on the basis of the extent of individual control (full, partial, minimal, or none) over money capital, physical capital, and labour within production. The resulting contradictory class locations now included: managers (simultaneously bourgeois and proletarian); non-managerial technical/professional staff (simultaneously petty-bourgeois and proletarian); and small employers (simultaneously bourgeois and petty-bourgeois). By 1979, Wright had a schematic typology that added five contradictory class locations to the three original Marxist classes (Wright 1985: 48 figure 2.2).