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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".
The 13 papers presented in this volume were carefully reviewed and selected from 53 submissions. They were organized in topical sections named: visualization case studies; visualization perspectives; analytics and decision; and Multi-Criteria Decision Making.

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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.

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