Solid Modeling Software capability of representing the sense of material with its familiar operations like drilling a hole or adding a slot. Solid modelers will be able to produce automatically cross sections and display with hidden lines removed

Surface Modeling

Data Exchange (In CADCAM) Data Exchange covers all the issue of exchanging models between different CAD systems. Standard like IGES, STEP are parts of this issue. Data Exchange is an active area od services

Computer Graphics

Associativity (in CADCAM) Ability of the CADCAM system to keep relationship between geometrical objects (like line parallel to another line) and to maintain the consistency between the geometrical model and the relationship when the model is changed