In his invited talk at ALA, Diederik will be discussing: multi-objective decision making. Firstly, he'll focus on why one should model decision problems as explicitly multi-objective, from a practical, as well as a mathematical, and an ethical perspective. Secondly, he'll discuss some lessons learned from his work in multi-objective problems, in the form of tips and tricks for getting started with multiple objectives. To conclude he'll go into the potential, and what he believes are the major open problems in multi-objective decision-making research.