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The methods for the Large Group Interventions used in an LSI-process stem from a range of disciplines:

• Action research
• Gestalt psychology
• Systems theory/ Chaos theory
• Organisation development
• Socio-technology

Profound testing and experiencing have led to a "family" of LGI-methods, with an extensive genealogy. Each method is associated with their developers, mostly American researchers. The figure illustrates the historical cohesion of theory and methods (click to enlarge). The source of the diagram is Leith Guide to Large Group Intervention Methods, by Martin Leith. This guide also offers a brief description of the history of the currently best known LGI-methods.