Future Informatics teachers need to have skills and abilities to continuously improve their knowledge in the field of both modern Information Technologies and modern methods of teaching Informatics. Specialists should constantly self-study because of the rapid pace in development of Informatics and Information Technologies. Thus, the high level of cognitive independence gives students real opportunities to integrate into the world information space, operating information resources presented in various forms. A new learning technology based on subject- and problem-oriented computer training programs and, in particular, multimedia programs is one of the ways to train highly qualified specialists. The programs help to improve the efficiency of learning technology, to intensify educational process, to improve the quality of training. At the same time, it is the role of an Informatics teacher that is significantly increasing. However, modern courses of Informatics do not adequately reflect the issues related to the theoretical and practical aspects of multimedia technology. This article describes our experiment on developing the components of cognitive independence of future Informatics teachers through learning, development and practical use of multimedia tools and gives the details of the used diagnostic material.