You are invited to participate in the upcoming Workshop on Data-Driven Decision Guidance and Support Systems (DGSS), to be held as part of the 29th IEEE International Conference on Data Engineering (ICDE 2013) in April 2013 at the Sofitel Hotel in Brisbane, Australia. Decision support systems (DSS) are widely used to support business or organizational decision-making. They are used to inform decisions at the management, operations and planning levels of an organization. Decision guidance systems (DGS) are decision support systems that go beyond organizing and displaying information, providing actionable recommendations to and extracting knowledge from human decision-makers. More specifically, Decision Guidance and Support Systems (DGSS) often need to: Use and mine large amounts of data collected from multiple sources; Learn deterministic or stochastic models of underlying processes from historical data; Learn objectives or decision preferences from decision makers' responses; Perform optimization under diverse constraints, e.g., from business or engineering limitations and laws of nature; and Present and justify actionable recommendations to decision makers.