This thesis examines which function the information technology may have in the children's library, with the example from two library computer programmes. One is an expert system, Hedvig, which will help children to choose and to find books, and the other is a computer game, The mysterious signs, that will teach children library user education. The main question is: What conceptions do the project-leaders, the children's librarians and the children have concerning the function of these two programmes in the children's library? The study is based upon qualitative interviews with two projects-leaders, four librarians, three computer programmers and twenty-eight children. The theoretical material consists of examples on other library computer programmes for children developed in Denmark and USA, some American studies in children's abilities to use computerized information retrieval systems, and studies concerning children's relations to computers. The adult's conceptions of the computer programmes are divided into categories as follows: Democracy, aspect of sex, complement, marketing, reading promotion, development of competence, information technology development, pedagogics, adult educational activities, compensation and armusement, pedagogics, usefulness, effectiveness and information. These categories shall be seen as the conclusions of the thesis.