STION 4 4 po at is the main reason for header files and forward declarations? They both allow you to incorporate and reuse code from one project to another much more easily. The headers and forward declarations give you a template for what you are trying to reuse. They allow you to declare any identifiers prior to their use. Occasionally things like race conditions can occure where function A needs to know about function b and function b needs to know about function a. There is no suitable way to solve this other than by using the above mentioned techniques. Forward declarations and header files do completely different things and have virtually nothing in common except that they are part of the c++ languages Headers and forward declarations solve problems of scale by allowing the programmer to specify parts of the problem that they wish to focus on and address