This paper is an extension of "Referential Consulting Networks" which explicated the concept of a network of referential consultants each of whom could "field" questions by: (a) answering them on the basis of his own expertise; (b) answer them with the help of library resources at his command; (c) refer the question to a colleague he judges to be more skilled than he in (a), (b), and (c). The querist, who originates a question of concern to him, is part of this network too. The question of primary concern in this paper is the trade-off between turn-around time (response time) and quality of the response. Small response time and high quality of the response both contribute to total benefit; also to total cost. A key factor determining both response time and quality is the quality of the directories available to the various referential consultants in the organization that services queries. A directory, exemplified by the "Yellow Pages", or a library catalog, points its user to the optional library resources and colleagues among which he makes choices. To design a referential consulting network is to; (1) select the number and kinds of referential consultants; (2) specify the directories which characterize each unit; (3) specify the way these units are interconnected. (Other papers from this conference are available as LI 003360 - 003370 and LI 003372 through LI 003390) (Author/NH)