Pierra, Guy2015-10-052015-10-0519901017-4656https://doi.org/10.2312/egtp.19901016The integration, in CAD systems, of libraries of standard parts is often considered to be one of the key factors for increasing productivity of Computer Aided Design [1] [2] [3]. These libraries must be able to integrate homogeneously both the standard components external to the firm (standardized items and suppliers' standards) and internal firm-specific standards.10.2312/egtp.19901016