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 1969-1990, 1991- 2005, and 2006-2012. This - Patterns of social constructions (the intellectual structure and ) of the DSS o Major schools of thoughts. o Cumulative research tradition. o Reference disciplines. - On-going dynamic changes in the intellectual structure. - Diffusion of o From the reference disciplines to DSS research subspecialties. o Within DSS research subspecialties.