It is argued that contemporary nursing education's emphasis on the consciou
s development of nurses' critical reasoning skills fails to take account of
the complexity of both human cognition and clinical nursing practice. Huma
n cognition centrally includes unconscious or tacit processes and clinical
nursing practice is typified by the simultaneous presentation of clinical a
nd non-clinical cues and competing clinical goals. Contemporary emphases on
conscious critical thinking are largely consistent with the differing theo
retical frameworks which have informed the study of nurses' clinical reason
ing in the last 30 years, most of which permit the use of simulated case st
udy. These frameworks, that is, decision theory, information processing and
skills acquisition theory, are described and their limitations highlighted
. In addition, an alternative theoretical framework, that of schema or scri
pt theory, which does take account elf the complexities of cognition and pr
actice, is discussed. Its implications for nursing practice and education a
re also outlined.