In the 21st century, the art of acting is now evaluated within objective and universal criteria. It is absolutely subjective (which does not leave a commentary). Not everyone, especially some non-educated people, disclose their prime and objective definition by engaging in non-scientific discourses about acting. So, what is acting? Acting is a state of conscious schizophrenia. Haluk Bilginer, an actor with an academic career in this field, defined the art of acting in an objective way. The concept of iştir being iştir has been accepted as the modern realistic acting theory within the art of acting. Stanislavski’s realistic acting theory appeared scientifically at the beginning of the 20th century, one of his students, Sonia Moore, further developed, going from the concept of acting by influencing Eric Morris, Stella Adler, Lee Strasberg and Marlon Brando; to make the transition to the concept. The realistic acting movement, whose seeds are laid in Russia, has grown in the United States and spread throughout the world. This theory is the only accepted scientific theory in many acting schools.
Richard Boleslavski and Maria Ouspenskaya, at the American Laboratory Theater, trained hundreds of American actors and directors with the Stanislavski System (Stella Adler, Ruth Nelson, Eunice Stoddard, Harold Clurman and Lee Strasberg, American Laboratory Theater before setting up the Group Theater. Harold Clurman and Lee Strasberg, together with Cheryl Crawford, met in 1925 at the Theater Guild and later founded the Group Theater (1931-1940). Lee Strasberg, Stella Adler and Sanford Meisner, who have collaborated with many actors, directors and educators who have contributed to the development of Method Acting, worked together at the Group Theater in the 1930s. In 1949, Strasberg made his contribution to Method Acts at the Actors Studio (1948-1982), Adler at the Stella Adler Conservatory (1949-1992) and at the Meisner Neighborhood Playhouse (1935-1997). Although they differ in some ways about the interpretation of the techniques they developed, they became the most influential names in making the Method its present. The method, along with the principles and methods of Stanislavski, is also based on the corrections and effects of Vakhtangov. Lee Strasberg, Stella Adler, Sanford Meisner, Uta Hagen, Robert Lewis and Elia Kazan. The main names in the popularity of Method Acting worldwide are Marlon Brando, James Dean, Anthony Quinn, Al Pacino, Robert De Niro, Robert Duvall, Paul Newman and Dustin Hoffman.