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The theory of conjunctive knowledge is the hidden basis of Karl Mannheim’s sociology of knowledge. This author is seeking to provide social sciences with a consistent method opposed to those of the natural sciences. Relying on phenomenology and sociology, it is a specific attempt to challenge the dominant conception of knowledge based on abstraction with no reference to subjectivity nor to social context. Against this conception, it reveals a type of knowledge that is situated, historical and presents a perspective rooted in existence. This knowledge creates links and relations between subjects who meet in a “space of experience” that is specific to them, where the dynamics of their community come into play. It finds an echo in contemporary research trends that acknowledge the sensitive and situated dimension of knowledge and clarifies the relationship between the subject and his environment, which is foundational in “clinical” approaches in social sciences and in studies in the field of work analysis.