The primary tasks of intervention activity are introduced in Chapter 1. In Chapter 2, the conditions necessary to develop the competence of any social system are explored. In Chapter 3 the probabilities that client systems will tend to manifest these conditions are examined, and in Chapter 4 it is shown that the research methods used by an interventionist may also inhibit his effectiveness. Chapter 5 represents an attempt to give some suggestions for the development of more organic research and diagnostic activities that may increase the interventionists' probabilities for effectiveness. In Chapter 6, the conditions under which interventionists will work are examined, and a primary intervention cycle is developed in Chapter 7. In Chapter 8 the conditions that lead to ineffective intervention activity are examined, and Chapter 9 contains an analysis of three cases where interventionists behaved ineffectively. Chapter 10 focuses on the problems of locating a client system; Chapter 11 follows with a detailed discussion of two introductory meetings with client systems. Chapter 12 discusses how to systematically select a potential client system, and in Chapter 13 some basic requirements for diagnostic methods are presented. The method used by the writer to diagnose systems is outlined in Chapter 14. Chapter 15 discusses the feedback process, and Chapter 16 deals with the problem of terminating ineffective relationships with client systems. (Author/CK)