This Recommendation is intended to provide the general accounting and settlement principles applicable to Public Directory Services' between interconnected Directory Management Domains (DMDs). In this context, a DMD is defined to be a collection of Directory System Agents (DSAs) and Directory User Agents (DUAS) managed by a single Domain Management Organization (DMO). The F.500 and X.500 Recommendations distinguish between two types of DMOs, administration and private organizations, and the two corresponding types of DMDs, Administration DMDs (ADDMDs) and Private DMDs (PRDMDs), respectively. The distinction between these two types of DMDs is that the former provides public directory services while the latter typically does not.