A distinction can be made between political theory and similar terms. Such as political science, political philosophy and political ideology, though many treat them interchangeably. The differentiation between political theory and political science arises because of the general shift in intellectual perceptions brought about by modern science. Political Science has tried to provide plausible generalisations and laws about politics and political behaviour. Political theory reflects upon political phenomenon, processes and institutions and on actual political behaviour by subjecting it to philosophical or ethical criterion. It considers the question of the best political order, which is a part of a larger and a more fundamental question; namely, the ideal form of life that a human being ought to lead within a larger community. In the process of answering immediate and local questions, it addresses perennial issues, which is why a study of the classical texts form an important component of the discipline. A classic in political theory has the essential ingredients of a great literary work, which in spite of its local setting, deals with the perennial problems of life and society. It contains the quintessence of eternal knowledge and is an inheritance not of any one culture, place, people or time, but of the entire humankind.