Adjust the internal rate of return (I) to

The rate of return required by the investor after the project risk. Chapter 24 information security system and security system 24.1 three dimensional space of information security system three dimensional space of information system security: Y-axis: OSI (open system interconnection) network reference model X-axis: security mechanism z-axis: security service the space formed by the three axes x, y and Z is the "security space" of information system