A computer-implemented method in a visualization module is provided. The visualization module comprises a processor configured by programming instructions encoded in non-transient computer readable media. The method comprises: receiving, by the processor from a user interface, a request for a visualization of decision steps made in an order allocation process; retrieving, by the processor from a database system, a plurality of data items belonging to the same order that identify rules applied at each decision step in the order allocation process, parameters used during rule application, and decisions resulting from rule application; generating, by the processor using the retrieved data items, a visualization that identifies the decision made at each decision step; and causing the visualization to be displayed on the user interface.