The number of children with disabilities is constantly increasing. Another disability that is increasing is hyperactivity. Hyperactivity and other disabilities in general are making education and daily obligations of students very hard. In order to reduce the effects of this disorder, it is necessary to discover it on time and to take action in the parental home and at school. They need to be supported by continuous improvements of class lectures and the methods used so the lectures are more interesting and so they can focus on their school obligations. It is essential to understand the disorder itself, its symptom, its impact on a hyperactive child and its environment so everyone involved can respond properly to help the child. Considering the information stated earlier, it is clear that this is a complex disorder that needs to be given greater more attention. For that reason, the paper will describe the disorder, its development and consequences, the process of identifying, supporting and educating parents, as well as the teachers who work with child. The paper will also show one example of a successful integration of a student with ADHD, a third-grader, who is taught on a full-time basis with the adaptation of teaching content and individualized procedures in Croatian language, Mathematics, Science class, English and with the support of a teaching assistant.