Materials play a significant role in the development of components and systems for Electrical Engineering. Knowledge of physical phenomena provides valuable information to improve performance by influencing the production or treatment processes, and better evaluate aging factors. Advances in the field of characterization, combined with accurate behavioral modeling can provide today valid representations in a wider range of constraints. Finally, the CAD tools including descriptions of properties provide increasingly sophisticated, with reduced prototype, a realistic functional description of complex systems. Progress in these three directions often evolve by “jumps” due to the emergence of new concepts which must be added the steps to promote eco-design. It is therefore important for the electrical engineering community to make an assessment on these topics. The interest of a multi-material approach, which allows specialists and users to meet and present their new work has been anyway amply demonstrated in all editions of the Symposium on Materials in Electrical Engineering MGE. MGE covers all materials used in electrical engineering and dedicated to electrical engineering, power electronics and electrochemistry. The main conventional properties of the studied materials (conductors, superconductors, dielectrics, magnetic, assets, etc.) are split into four research areas: – Materials: manufacturing processes, intrinsic properties or use properties. – Characterizations: principles, experimental design, new demands, new constraints. – Modeling: digital techniques and analytical processes, CAD tools. – Applications: design, materials dedicated applications induced properties. The 5th and latest edition of MGE symposium was held in Montpellier between August 30 and September 1, 2010. For the first time, the MGE symposium was organized in conjunction with the 7th Conference of the French Society of Electrostatics “SFE 2010”, bringing together especially around a joint session of the scientific community actors of materials for electrical engineering and electrostatics. Among the 37 papers presented at MGE 2010, 11 extended papers, particularly concerning the field of dielectric and magnetic materials, are published in this special issue of EJEE.