Keep It Simple - While it is tempting to include all the "bells and whistles" into your application, in  most cases you are further ahead to implement the basic system so  the software can begin "paying for itself" and later add additional functionality. If the system is designed properly these features can be added without endangering the integrity of the application and without any additional expense as if they were added during the initial development.
 
Minimize Training - If you are converting an existing system, keeping the look and feel of the application similar will reduce training time and acceptance of the application by the end-users.
 
Follow Windows Standards - By designing the application to behave like Microsoft Windows or Microsoft Office you can reduce training time.
 

Hardware Considerations - Even the best application will perform poorly on outdated hardware. It is important to ensure your operating system, servers and workstations are able to accommodate your new software application.