The eternal problem of the human being is how to structure his waking hours. In this existential sense, the function of all social living is to lend … - Eric Berne

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The eternal problem of the human being is how to structure his waking hours. In this existential sense, the function of all social living is to lend mutual assistance for this project.
The operational aspect of time-structuring may be called programing. It has three aspects: material, social and individual. The most common, convenient, comfortable, and utilitarian method of structuring time is by a project designed to deal with the material of external reality: what is commonly known as work. Such a project is technically called an activity; the term “work” is unsuitable because a general theory of social psychiatry must recognize that social intercourse is also a form of work.