The main purpose of the book is to present the topic „multimedia in education" in different aspects: methodology of using multimedia at the lesson, influence on students' self-confidence, effectiveness of media-supported education, individualization of learning with using multimedia etc. Also a few research projects in this field are described. The book is based on own experiences of the author. These experiences were gathered in the past, during author's work as a teacher of mathematics and computer science, and recently, during her work at the university as an academic teacher who still cooperates with practicing teachers. The most important thing that author wants to pass by this book is: computers and multimedia are the tools that should help to teach students thinking: not treating computer only as a source of fun, but as a tool that can support thinking, discovering knowledge and can give a feeling of happiness that comes from successful learning. Also the book is some kind of invitation to cooperation referred to all Readers who are interested in the research on effectiveness (or other aspects) of multimedia-supported education.