A graphical user interface (GUI) is provided for use in conjunction with attribute evaluation utilizing computation rules and a combining policy. The graphical user interface displays a visual representation of the evaluation of attributes. The GUI displays a representation of the evaluation status of attributes and their associated computation rules during execution. The display may be updated dynamically to provide a user with a visual representation of the progression of attribute evaluation. The representation of evaluation status may include representations of the values assigned to, as well as the state of, data items and associated computation rules. States may be visually represented in the display in various ways, such as using various colors or labels associated with the data items and associated computation rules. Further, the particular data items and computation rules for which evaluation status is represented may be user selectable.