The first empirical evidence of the effectiveness of the client-centered approach was published in 1941 at the Ohio State University by Elias Porter, using the recordings of therapeutic sessions between Carl Rogers and his clients.
Det första empiriska beviset på den personcentrerade inriktningens effektivitet publicerades 1941 vid Ohio State University av Elias Porter, som använde bandupptagningar av terapeutiska sessioner mellan Carl Rogers and hans klienter.