The field of numerical methods for complex systems is moving towards the development of more efficient and accurate techniques for solving coupled problems. Researchers are focusing on creating high-order methods that can handle complex geometries and nonlinearities, with a emphasis on stability, convergence, and computational efficiency. The use of adaptive sampling procedures, hyperreduction, and novel finite element methods are being explored to improve the performance of reduced-order models and computational simulations. These advancements have the potential to significantly impact various fields, including aerodynamics, hydrodynamics, and geotechnical engineering. Noteworthy papers include: A high-order combined interpolation/finite element technique for evolutionary coupled groundwater-surface water problems, which demonstrates unconditionally stable and temporally second-order accurate results. A polyhedral scaled boundary finite element method for three-dimensional seepage analysis, which achieves higher accuracy and faster convergence compared to conventional FEM.