This manual consists of two Parts and an Epimetro.

In Part A, it was deemed necessary to refer to the educational encyclical developed in the 5th century BC in Athens for two reasons: a) because it is related to the earlier name of the cognitive object as "Encyclopedia of Theology" and b) because it contributed significantly to the cultivation of human thought, the dialogue of the Gospel with the cultural environment of the Greek-speaking East, and the development of academic institutions and sciences in the West and subsequently worldwide.

Next, the characteristics of the two approaches to our cognitive object are presented and compared with their earlier names, "Encyclopedia of Theology" and "Introduction to Theology". The timeless meanings of the term "Theology" in ancient Greek and Christian literature are examined. The study of Theology in the educational institutions of the Greek-speaking East and the Latin-speaking West is depicted over time, the creation of the first universities in the West with the administrative and operational structures that govern modern universities, the study of Theology in recent years, the questioning and acceptance of it among the sciences, theological studies in Greece, and the future of Theology in the modern university.

In Part B, texts of contemporary theological reflection from the 1960s onwards are presented, which highlight the characteristics of Orthodox Theology, its relationship with the Church, the dynamic and static perception of the patristic tradition, the scientific methods, and the cultural environment in which theological thought is cultivated, as well as the need for the contemporary witness of the Christian faith.

In the Epimetro, prospective researchers can find comprehensive guidelines for conducting scientific research: defining the topic, methodology, bibliography, data collection and evaluation, composition, structure, language style, citation system, bibliography, and table of contents.