In this thesis I shall examine the relationship between computers and the main users of computers in Lycees in Turkey in order to create a model of computer use in Turkey. Systems theory is used to define the sort of model or picture of users that a decision maker needs in order to provide a formal means of incorporating users and their needs into the system. Data are gathered and combined into a rich picture of the users. The 'soft' systems methodology developed by Checkland is used to test the rich picture and link it with monitoring of computer effectiveness in schools. Application of the Checkland methodology is a crucial step which shifted the emphasis of the project from qualitative to conceptual modelling. The methods of data collection and the results are described as the user survey. The following techniques are used: questionnaires, and semi-structured interviews. The data gathered by those methods presented a consistent picture in which the nature of the users' work, i.e. teachers, students, was the dominant influence on using computers in their learning and teaching. Application of the Checkland Methodology and the conceptual models derived from it are described as the systems study. A detailed description of the use of computers in mathematics is necessary in order to generate performance criteria. In addition, the rich picture from the user survey is found to be a fair representation of reality. Comparisons of each model with real world dynamism are undertaken. The comparisons indicate there are appreciable differences. Some implications of the study's findings are presented.