The development of modern technologies and their extension to every domain of our daily life nowadays is an indisputable fact. The widespread use of computers renders training in these technologies necessary. Consequently, computers were soon introduced into the Greek educational system. Factors related to the nature of the teacher's personality, such as computer self-efficacy, self-concept, attitudes, motivation and needs are considered crucial to the integration and development of modern technologies in education. This study examines the relationship between individual characteristics of secondary school teachers and computer self-efficacy as well as teacher prospects with regard to modern technologies.