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: o Major schools of thoughts. o Cumulative research tradition. o Reference disciplines. - On-going dynamic changes in the intellectual structure. - Diffusion of ideas: o From the reference disciplines to DSS research subspecialties. o Within DSS research subspecialties.