This study is an attempt to examine the information needs and use in everyday tasks in the work environment of community health nurses. The purpose of this paper is double to examine the information need and use of the community health nurses and to test and validate a method and a theory for the studying of information need and use in workers everyday tasks adapted from Byström and Järvelin (1995). Most of the data were collected through diaries kept by the informants in close relationship to the problem situations and were analysed qualitatively. Furthermore a literature survey was made in nursing infomatics and information science and it showed that there is no absolute common ground between the disciplines in the way they use the information concept. The theory and method were validated in a broad outline and were very useful in the study of community health nurses' information needs and use. The study also shows that the context of community health nurses plays an important role in the nurses information behaviour.