The paper by M. Ashby and D. Cebon presents a novel materials selection procedure implemented in software, which uses Materials Selection Charts and performance indices to optimize both material and shape selection for engineering components. The performance indices are combinations of material properties that govern the component's performance, such as specific stiffness (E/ρ). The procedure involves plotting these indices on a materials selection chart, where the area satisfying the selection criterion is identified. The Cambridge Materials Selector (CMS) software allows users to perform multiple selection stages, modify criteria, and store results for future reference. The paper includes case studies on selecting materials for oars and precision instruments, demonstrating the effectiveness of the method. The authors conclude that the software provides an interactive graphical environment suitable for mechanical engineering design, enabling the selection of materials with optimal properties and shape.The paper by M. Ashby and D. Cebon presents a novel materials selection procedure implemented in software, which uses Materials Selection Charts and performance indices to optimize both material and shape selection for engineering components. The performance indices are combinations of material properties that govern the component's performance, such as specific stiffness (E/ρ). The procedure involves plotting these indices on a materials selection chart, where the area satisfying the selection criterion is identified. The Cambridge Materials Selector (CMS) software allows users to perform multiple selection stages, modify criteria, and store results for future reference. The paper includes case studies on selecting materials for oars and precision instruments, demonstrating the effectiveness of the method. The authors conclude that the software provides an interactive graphical environment suitable for mechanical engineering design, enabling the selection of materials with optimal properties and shape.