The theory and practice of group psychotherapy
TL;DR: Yalom as mentioned in this paper described the course of therapy from both the patient's and the therapist's viewpoint in Encounter Groups: First Facts (1973) and Every Day gets a Little Closer: A Twice-Told Therapy (1974).
Abstract: This book first appeared in 1970 and has gone into two further editions, one in 1975 and this one in 1985. Yalom is also the author of Existential Psychotherapy (1980), In-patient Group Psychotherapy (1983), the co-author with Lieberman of Encounter Groups: First Facts (1973) and with Elkin of Every Day Gets a Little Closer: A Twice-Told Therapy (1974) (which recounts the course of therapy from the patient's and the therapist's viewpoint). The present book is the central work of the set and seems to me the most substantial. It is also one of the most readable of his works because of its straightforward style and the liberal use of clinical examples.
...Yalom (1985) focused onthe psychological process of universality, recognizing similaritiesamong oneself and others, as a critical factor in the development ofpsychotherapy groups....
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...Ironically, despite their increased need for psychological treatment, people who keep secrets in therapy are less likely to receive help for their problems (Hill et al,, 1993; Kline, 1986; Stiles, 1987; Yalom, 1985)....