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An integrated CAD/CAPP system is proposed based on STEP standard for feature-based process planning. The proposed system helps designers and process planners to improve their design and planning in the early stages of the product life cycle. In the design stage (CAD), a feature-based design system has been developed to construct mechanical parts in terms of high-level 3D solid features. The designed part is then exported as a STEP AP224 XML data format which can be used to integrate into CAPP system without feature recognition process. In process planning stage (CAPP), an intelligent process planning system has been developed to map STEP AP224 XML data and produces the corresponding machining operations to generate process planning data. A hybrid approach of neural network and expert system is used as the inference engine of the proposed CAPP system. [ABSTRACT FROM AUTHOR]