There are two principles of usability that apply to the development process. These principles are simple and easy to apply.
Usability makes everything easier, except the job of the developer.
Usability is not easy. There are no macros to run on Macromedia Flash projects to apply usability. Applying usability requires a change in the development process. It requires a new method of thinking about a project from start to finish. However, understanding usability makes the job of the developer easier and the end product better.