Both his struggles with Chekhov's drama (out of which his notion of subtext emerged) and his experiments with Symbolism encouraged a greater attention to "inner action" and a more intensive investigation of the actor's process. He began to develop the more actor-centred techniques of "psychological realism" and his focus shifted from his productions to rehearsal process and pedagogy. He pioneered the use of theatre studios as a laboratory in which to innovate actor training and to experiment with new forms of theatre.