Part I: Societal and Ecological Systems -- ProtestLab - A Computational Laboratory for Studying Street Protests -- A Generic Agent based Model of Historical Social Behavior Change -- Understanding Social Systems Research -- ForestSim: An Agent-Based Simulation for Bioenergy Sustainability Assessment -- Toward a Complex Concept of Sustainability -- Effects of Policy Decision-making on Riparian Corridors in a Semi-arid Desert: a Modeling Approach -- Part II: Approaches for Understanding, Modeling, Forecasting and Mastering Complex Systems -- Dialectical Systems Theory as a Way to Handle Complex Systems -- Reducing Complexity of Nonlinear Dynamic Systems -- A Few Reflections on the Quality of Emergence in Complex Collective Systems -- Link Structure Analysis of Urban street Networks for Delineating Traffic Impact Areas -- Logic, Mathematics and Consistency in Literature: Searching for Don Quixote's Place -- Energy-Efficient Buildings as Complex Socio-Technical Systems: Approaches and Challenges -- Part III: Real-life examples -- Modelling Space-Time-Action Modularity and Evolution of Living Systems.