This book tackles a really important topic, extremism, which is a serious problem for the individual and society. This book contains information that will make a real difference to all its readers. The new in this book, is the approach to the phenomenon of extremism from the perspective of psychological counseling, as it dealt with an attitude towards extremism in the light of Johari Window and Strenberg theory of thinking styles. As well as the role of counseling and psychotherapy in the face of this phenomenon, it also provides a planning for a therapeutic program to reduce the attitude of adolescents and youth to extremism by modifying their thinking and increasing self-disclosure. And then provides the ethics for the counseling and psychotherapy practices in the field of extremism. Thus this book focuses on the eyes and glasses of the counselor and psychotherapist, and is therefore directed to the general psychologists, and specialists in counseling and psychotherapy in the field of extremism particularly.