Experimentelle Untersuchungen über Qualitative Arbeitstypen, by Ludwig Pfeiffer, presents a detailed exploration of qualitative work types through experimental research. Published in 1908, this study offers valuable insights into the psychology of work and the categorization of labor. Pfeiffer's work provides a foundational understanding of the cognitive processes involved in different types of work, making it a significant contribution to both psychology and the emerging field of industrial organization. This historical text remains relevant for researchers and students interested in the early development of experimental psychology and its application to understanding human labor.

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