This paper develops a theory of strategic group identity that explains
how strategic groups emerge in an industry and how they can affect fi
rm behaviors and outcomes. In so doing, it provides a theoretical basi
s for the existence of strategic groups. We argue that managers cognit
ively partition their industry environment to reduce uncertainty and t
o cope with bounded rationality. Social learning theory and social ide
ntification theory are used to describe how cognitive groups coalesce
into meaningful substructures and how a group-level identity emerges.
We describe the ways in which macro level factors condition the develo
pment of groups and their identities. We introduce the notion of a str
ong identity, which characterizes any group sufficiently recognized an
d attended to by members to affect individual action. Groups with 'wea
k identities' are no more than transient agglomerations of firms and d
o nor exist in any meaningful sense. These ideas are developed into pr
opositions that describe the conditions under which groups with strong
identities are likely to emerge. A second set of propositions describ
es their transformation over time. Identity strength is linked to both
positive and negative outcomes in a final set of propositions. We sho
w how strategic groups with strong identities can affect firm performa
nce resolving a longstanding problem which has plagued strategic group
s research and conclude by suggesting some approaches for measurement
and future research. (C) 1997 by John Wiley & Sons, Ltd.