This book constitutes the proceedings of the Third International Conference on Decision Support Systems, ICDSST 2017, held in Namur, Belgium, in May 2017. The EWG-DSS series of the International Conference on Decision Support System Technology (ICDSST) offers a platform for European and international DSS communities, comprising the academic and industrial sectors, in order to present state-of-the-art DSS research and developments, to discuss current challenges that surround decision-making processes, to exchange ideas about realistic and innovative solutions, and to co-develop potential business opportunities. The main topic of this year's conference was "Data, Information and Knowledge Visualization in Decision Making".

Visualization Case Studies.- Visual decision support system for helping physicians to make a decision on new drugs.- Automatic traffic enforcement camera operation, based on a business intelligence system.- Multicriteria decision making for healthcare facilities location with visualization based on FITradeoff method.- Business process modelling and visualization to support e-government decision making: Business/IS alignment.- Visualization Perspectives.- Visualization for decision support in FITradeoff method: exploring its evaluation with cognitive neuroscience.- Incorporating Uncertainty into Decision-Making: An Information Visualization Approach.- Process Analytics Through Event Databases: Potentials for Visualizations and Process Mining.- Value of Visual Analytics to South African Businesses.- Analytics and Decision.- Conceiving Hybrid What-If Scenarios Based on Usage Preferences.- A semantics extraction framework for decision support in context-specific social web networks.- A method for energy management and cost assessment of pumps in Waste Water Treatment Plants.- MCDM.- Implementation of an extended fuzzy VIKOR method based on triangular and trapezoidal fuzzy linguistic variables and alternative deffuzication techniques.- Integrating System Dynamics with exploratory MCDA for robust decision-making.