This is a rather interesting but puzzling link to Who Shall Survive. It has a different subtitle. Adds Helen Jennings as an author.
The description there about relationships is one that I have not seen summed up so well before. The idea is central to the work, but not often one that people focus on.
Who shall survive?: A new approach to the problem of human interrelations
Jacob Levy Moreno, Helen Hall Jennings
Nervous and mental disease publishing co., 1934 – Psychology – 440 pages
In approaching the contents of this book, the reader must not expect to find society or social groups considered as if they consisted of the sum of the individuals composing them. Wherever two or more people are functioning as a social group that group not only consists of those individuals, but, more important perhaps, if that is possible, than the individuals themselves and without which their functioning as a social group cauld not be expressed, are the relations which maintain between them. It is these intangible, imponderable and invisible aspects of the situation which enable the mathematical sum of a certain number of individuals to function as a social group. Dr. Moreno’s book might he described briefly as a study of these relations between individuals. Dr. Moreno develops a technique for a process of classification which is calculated, among other things, to bring individuals together who are capable of harmonious inter-personal relationships, and so creating a social group which can function at the maximum efficiency and with the minimum of disruptive tendencies and processes. (PsycINFO Database Record (c) 2005 APA, all rights reserved).