IN RECENT YEARS, CONCURRENT/SIMULTANEOUS (C/S) ENGINEERING HAS BECOME INCREASINGLY STUDIED BY MANUFACTURING ENGINEERS. CONSIDERABLE EFFORTS HAVE BEEN MADE IN THE DEVELOPMENT OF THE ANTICIPATED C/S ENGINEERING ENVIRONMENT. COMPUTER-AIDED PROCESS PLANNING (CAPP) HAS BEEN RECOGNIZED AS PLAYING A ROLE IN REALIZING THE GOAL OF THE C/S ENGINEERING ENVIRONMENT. THIS PAPER ADDRESSES THE BACKGROUND OF C/S ENGINEERING AND RELATIVE RESEARCH ACTIVITIES. THE WAY IN WHICH THE PROCESS PLANNING FUNCTION CAN THRUST INTO A KEY ROLE IN C/S ENGINEERING IS ADDRESSED. THIS PAPER PROVIDES A SYSTEMATIC DISCUSSION ABOUT MULTIPLE MANUFACTURING FUNCTIONS INTEGRATION BY USE OF CAPP AS A CENTRAL ELEMENT WITHIN THE C/S ENGINEERING ENVIRONMENT.