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Longitudinal Author Cocitation Mapping focuses on specific aspects of the decision support systems (DSS) history by means of an empirical assessment of the DSS literature over three consecutive time periods: 1969-1990, 1991- 2005, and 2006-2012. This includes: Patterns of social constructions (the intellectual structure and ) of the DSS field: Major schools of thoughts, Cumulative research tradition, Reference disciplines. On-going dynamic changes in the intellectual structure. Diffusion of ideas: From the reference disciplines to DSS research subspecialties, Within DSS research subspecialties.