[Implicit theories--the problems of thought economy]

Based upon the presentation of the concept of naive implicit theories the article relates experience and action-guiding knowledge in critical nursing situations. Nineteen experienced and inexperienced nurses had to deal with two simulated nursing situations. Thereafter their implicit knowledge was explicated. Separate analyses for experienced and inexperienced persons regarding the adequacy of this knowledge and naive theories were performed. The results show for example, that in both groups naive theories can be found which relate especially to the perception of the patient. They led to inadequate action even though adequate knowledge was also represented. Finally, it is discussed how such (often not consciously used) naive theories can be changed in practice and which processes play a role in this change.