Infectiousness, convinsingness and charm form the united block of characteristics in actor's abilities' structure, determining the exactness of scenic transformation. The ability to infect is conditioned by the effectiveness of regulative mechanisms, ensuring the exactness of actor's corresponding to scenic image emotional reactions to psychological sense of a performance and to its aesthetic originality. The ability to be convincing is conditioned by the compliance of actor's imagination during role's construction to certain restrictions ensuring role's logical validity. Actor's charm plays part of a restriction too-it limits actor's subjectivity by audience's certain social expectations, securing the correspondence of scenic image to objective social values.