Basic Concepts -- to Model Order Reduction -- Linear Systems, Eigenvalues, and Projection -- Theory -- Structure-Preserving Model Order Reduction of RCL Circuit Equations -- A Unified Krylov Projection Framework for Structure-Preserving Model Reduction -- Model Reduction via Proper Orthogonal Decomposition -- PMTBR: A Family of Approximate Principal-components-like Reduction Algorithms -- A Survey on Model Reduction of Coupled Systems -- Space Mapping and Defect Correction -- Modal Approximation and Computation of Dominant Poles -- Some Preconditioning Techniques for Saddle Point Problems -- Time Variant Balancing and Nonlinear Balanced Realizations -- Singular Value Analysis and Balanced Realizations for Nonlinear Systems -- Research Aspects and Applications -- Matrix Functions -- Model Reduction of Interconnected Systems -- Quadratic Inverse Eigenvalue Problem and Its Applications to Model Updating — An Overview -- Data-Driven Model Order Reduction Using Orthonormal Vector Fitting -- Model-Order Reduction of High-Speed Interconnects Using Integrated Congruence Transform -- Model Order Reduction for MEMS: Methodology and Computational Environment for Electro-Thermal Models -- Model Order Reduction of Large RC Circuits -- Reduced Order Models of On-Chip Passive Components and Interconnects, Workbench and Test Structures.