<P> Strasberg's students included many prominent American actors of the latter half of the 20th century, including Paul Newman, Al Pacino, George Peppard, Dustin Hoffman, James Dean, Jared Leto, Marilyn Monroe, Jane Fonda, Jack Nicholson, Mickey Rourke, among others . </P> <P> Some American acting teachers inspired by Stanislavski broke off with Strasberg, believing his method was not an authentic adaptation of Stanislavski's system . </P> <P> Sanford Meisner, another Group Theatre pioneer, believed the method was far too focused on the internal workings of the actor, and that acting should be "outside in" rather than "inside out". His ideas came to be called the Meisner technique . He advocated actors fully immersing themselves "in the moment" and concentrating on their partner (what Stanislavski called "communication" and "adaptation"). Meisner taught actors to achieve spontaneity by understanding the given circumstances of the scene . He designed interpersonal exercises to help actors invest emotionally in the scene, freeing them to react "honestly" as the character . Meisner described acting as "living truthfully under imaginary circumstances". </P> <P> Robert Lewis also broke with Strasberg . In his books Method--or Madness? and the more autobiographical Slings and Arrows, Lewis argued that method acting was too focused on pure emotional training and neglected vocal and physical training, which forms a fundamental part both of classical actor - training and of Stanislavski's system . The method's reliance on emotion, he felt, could too easily encourage overacting . </P>

Why did the method acting teachers of the group theatre split up