Coaching sessions are strictly confidential. If we want to know what happens in them, we must rely on anonymized studies. The goal of this chapter is to describe and analyze the procedures and processes in coaching sessions. Of particular interest are the so-called success factors, which are general behavioral and interactional characteristics of the coach and client in the processes or in the working alliance on which the results of coaching are assumed to depend. Examples include mutual appreciation or resource activation. Questionnaires with rating scales and observational studies of the behavior of clients and coaches in the process of coaching are used to identify these factors. The chapter provides an overview of questionnaire scales, which can be applied by researchers and coaches. Different models of factor scales based on recent statistical analyses are presented.