Objectives: The aim of this review paper is to summarize the challenges facing research on the alliance now and going forward. The review begins with a brief overview of the development of the concept of the alliance in historical context. Method: A summary of what has been accomplished both within the psychotherapy research community and in other professions is presented. Current challenges facing this line of research are identified, including the existence of a wide range of operational definitions that results in a diffusion of the identity of the alliance concept. It is argued that the current situation generates risks to incremental growth in several lines of research. Conclusions: A case is made that a lack of clarity regarding how several variables within the broader category of therapeutic relationships fit together, overlap, or complement each other is also potentially problematic. Efforts to resolve the lack of a consensual definition are reviewed, and in conclusion, it is argued that a resumption of a conversation about the relationship in the helping context in general, and the alliance in particular, should be resumed.
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