The conception of interpersonal relations' development diagnostics is worked out and the system of methodical means for this integral index evaluation by the definition of the unity of value orientations is offered. System-forming character of "stand opposition grating" principle is shown as well as the possibility of this principle's extention to different strata of intra-group activity. The typology of "opposition gratings" is presented and certain correspondence of differentiating principles, being the base of "gratings", is demonstrated. The latter play part of constructs along which group activity develops.