After the user has selected the desired design option, the appropriate parameters are displayed in a table. In nearly all cases, default values are specified for each parameter field which may be modified. When all parameters have been specified, selecting the "Calculate" button will submit the program and produce a results page. On the results page, selecting the "Respecify"button returns to parameter specification, where the defaults become the last computed values and a new computation can be requested. This re-cycle option allows the user to observe the change in one parameter (e.g., power) as one (e.g., sample size) of the others are varied. The "Default" button will reset all specified parameter values to original defaults. The "Undo" button will clear any modifications made to current defaults.