A graphical user interface of an external control device for controlling operation of an implantable medical device while minimizing the occurrence of human error. The graphical user interface displays the operating parameter of the implantable medical device simultaneously as an Arabic numeral and a graphical representation. When a parameter value is adjusted, the current and adjusted values are simultaneously displayed as both an Arabic numeral and graphical representation. Other means are described for increasing the probability of detection of an error during entry of an operating parameter value prior to implementation. Execution of the graphical user interface is subject to interruption. When function of the graphical user interface programming is restored operation resumes from that which it left off prior to interruption.