The aim of this book is to present the conditions under which the positive role of supervision over courts and judges can be performed, and to shed light on what conditions have to be fulfilled in order to achieve the goal of creating an impartial and professional judiciary system. The analysis has normative and sociological nature, and is presented from various points of view, including international and national legal systems such as Austria, Denmark, Germany, Poland, Slovakia and Sweden. The research has come to the conclusion that administrative supervision may be used as a feasible instrument for making the courts’ activity more effective. It can improve the organization of the courts’ adjudication and may lead to an increase in the quality of jurisprudence.