Related objects are displayed in a user interface. An index value (or other identifier) is associated with each resource in a particular resource group, and this index value enables grouping the resources when a representation of the group is displayed. Spatial consistency may be maintained by displaying the resource groupings in order by their index value, and this order may be maintained over time as the displaying is repeated. The resources in the groupings may correspond to nodes and links in message flows. Preferably, the resources are dynamically determined by observation of their interactions, such as observing the participation of nodes and links in message flows.