On the basis of familiarity with the everyday world, trust is principally interpersonal trust (and is therefore limited). It serves to overcome an element of uncertainty in the behaviour of other people which is experienced as the unpredictability of change in an object. In so far as the need for complexity grows, and in so far as the other person enters the picture both as alter ego and as fellow-author of this complexity and of its reduction, trust has to be extended, and the original unquestionable familiarity of the world pushed back, although it cannot be eliminated completely. It becomes as a result a new form of system trust, which implies renouncing as a conscious risk some possible further information and implies as well a wary indifference to and a continuous control of results. System trust is not only applicable to social systems but also to other people as personal systems. This change, if one looks closely at the assumptions which lie within the mode of trusting, corresponds to a change from bases of trust which are defined in primarily emotional terms, to those which are primarily performance based.

DEFINE: Distinguishes interpersonal trust (emotional, limited) from system trust (performance-based, extended with conscious risk and wary control). XREF: Connects to Luhmann's sociology of trust and complexity, and to discussions of trust in institutions versus personal relationships.

Niklas Luhmann, Trust and Power, loc. 143