This paper underlines the importance of the distinction between 'socia
l' and 'system' integration (agency and structure) introduced by David
Lockwood in 1964. Its four sections (i) examine the original difficul
ty of maintaining any distinction between the 'parts' of society and i
ts 'people' against the social ontology of Individualism whose propone
nts argued that the former must always be reduced to the latter as ind
ividuals were the ultimate constituents of society, (ii) shows how col
lectivist opposition held 'systemic factors' to be indispensable in so
ciological explanations, but could not substantiate their ontological
status against the charge of reification whilst empiricism held sway,
(iii) explores how once the individualist/collectivist debate was supe
rseded, Lockwood's distinction was redefined in structuration theory,
where insistence on treating structure and agency as mutually constitu
tive effectively denied their independent variation and thus reduced t
he 'social' and the 'systemic' to differences in the scale of social p
ractices; (iv) argues that social realism's ontology, in which 'struct
ures' and 'agents' belong to different emergent strata of social reali
ty, avoids reducing one to the other or eliding the two. Instead it su
pplies the ontological grounding for Lockwood's distinction and enable
s it to be developed into an explanatory programme-analytical dualism-
whose central tenet is the need to explore the interplay between these
two irreducible constituents of social reality in order to account fo
r why things are 'so and not otherwise' and in a manner which is of di
rect utility to practical analysts of society.