1. A method for displaying assertion evaluation information of a temporal expression comprising: generating a data structure for processing a temporal expression; evaluating the temporal expression and generating evaluation information representative of processing steps in the evaluation of the temporal expression; and displaying a graphical representation of the evaluation information of the temporal expression, wherein said graphical representation allows for a user to selectively display the evaluation information for each processing step in the evaluation of the temporal expression, wherein the graphical representation having a first area and a second area, and wherein the data structure is displayed in the first area and the evaluation information is displayed in the second area, wherein said data structure is a bubble tree having a plurality of bubbles and wherein in said second area a bubble-specific timeline for each bubble, whose temporal expression name is unfolded in the first area, is displayed adjacent to respective temporal expression name in the data structure in the first area.