The power to receive amicus curiae briefs in investment disputes provides a similar example. Tribunals have begun to recognize that their cases involve important “public interest” aspects extending “far beyond those raised by the usual transnational arbitration between commercial parties”. [8] The growing movement to accept amici allows “exogenous” factors to permeate the field of investment arbitration, but conflicts with the rather weak consideration that is given to such factors in the actual legal reasoning of tribunals. The language of expansion serves the purpose of self-legitimation, shoring up the authority of the tribunals involved, to a far greater degree than that of systemic integration.