The study sums up those psychological and social/psychological theorie
s that are systematicly concerned with identity. It introduces briefly
a survey of opinions supported by prominent representatives of the th
eory of ego-identity formation, of the theory of identity in the symbo
lic interaction theory, of the theory of social identity in psychology
of intergroup behaviour and intergroup relations, of identity in the
approach of social construction theory and integrating theories of ide
ntity. The above mentioned theories issue from different theoretical b
ackground; they use different terminology, assigning different meaning
s to identical terms; they differ what concerns the depth of working o
ut the terms and their mutual relations; it is difficult, therefore, t
o compare and evaluate them mutually. In spite of this, they are still
used in professional literature, being vivid, inspiring, complemented
and enriched; they prove the contribution of psychology to working ou
t an interdisciplinary problem, such as the identity undoubtedly is.