Abstract: The purpose of this article is to identify early and recent Pentecostal studies in the West and to highlight the main difference between them. Today there are more than 250 million Pentecostals in the world, and together with the charismatic movement there are more than 500 million. Having begun to spread in the 20th century, the movement claims to be the fastest growing religious phenomenon in human history. In attempts to interpret the phenomenon of the movement's growth, there have been several gradually emerging approaches: explaining the origin of the movement as supernaturally "coming from heaven"; searching for the origins of Pentecostalism in other Christian movements; presenting the emergence of the movement as the result of social and psychological factors such as poverty, marginalization, and the desire to escape from modern society; and the multicultural approach. The paper analyzes the works of Western historians and theologians of Pentecostalism since the second half of the 20th century. The result shows a turning point between early and late studies, namely that late studies aim to revise the history and include participants in the movement around the world, not just in North America, explore the contribution to the development of the movement of local ministers who have long remained in the shadow of Western missionaries, emphasize the diversity of ideologies and social influences that have shaped the movement. It also highlights three major contemporary areas of research: historical, characterized by studies of Pentecostalism in Asia, Africa, and Latin America; theological, focusing on the development and shaping of theoretical theology as a result of the movement's institutionalization; and religious studies, practiced primarily from the perspective of the sociology of religion.