An apparatus, method and computer program for performing a plurality of operation steps of a dialysis process is disclosed. In one embodiment, a process controller controls the apparatus to perform the operation steps, monitor the dialysis process and monitor sensor inputs of sensors of the apparatus. The apparatus further includes a user interface (“UI”), comprising a display, an input device and a UI controller, wherein the UI controller enables presentation of graphical data on the display, enables user interaction with the graphical data and exchanges information with the process controller. Each of the operation steps is classified as a sequential operation step or a non-sequential operation step. The UI controller, for each of the operation steps, dynamically controls enabling and disabling of interaction with displayed corresponding operation step items based on a state of the respective operation step (i.e., completed, non-completed, selectable, non-selectable).
