Introduction (B. Falkenburg, M. Morrison) -- Reduction: On the Success and Limitations of Reductionism in Physics (H. Meyer-Ortmanns) -- On the Relation between the Second Law of Thermodynamics and Classical and Quantum Mechanics (B. Drossel).- Dissipation in Quantum Mechanical Systems - Where is the System and Where is the Reservoir? (J. Ankerhold) -- Explanation via Microreduction - One the Role of Scale Separation for Quantitative Modelling (R. Hillerbrand) -- Emergence: Why is More Different? (M. Morrison) -- Autonomy and Scales (R. Battermann).- More is Different...Sometimes: Ising Models, Emergence, and Undecidability (P. Humphreys) -- Functional Reduction and Emergence (S. Bangu) -- Parts and Wholes: -- Stability, Energence and Part-Whole Reduction (A. Hüttemann, R. Kühm, O. Terzidis).- Between Rigor and Reality: Many-Body Models in Condensed Matter Physics (A. Gelfert).- How Do Quasi-Particles Exist? (B. Falkenburg).- A Mechanistic Reading of Quantum Laser Theory (M. Kuhlmann).