The pane at the top of the tab displays the list of Disciplines and their attribute values and, except for Stand Alone Clash Manager, are read-only. For Stand Alone Clash Manager, a Popup Menu is available (mouse right-click) with options to Add, Edit, Delete and Set as Default. This is used to add a new discipline, edit an existing discipline, remove an existing discipline and automatically set a discipline as default. Using this menu, the user creates the list of Disciplines and their attributes that Clash Manager can match with the values of the specified attribute.

It is necessary to tell Clash Manager how to identify a discipline from a clashing element’s attributes or its owner’s attributes. The Attribute box enables the user to do this by specifying the particular attribute that, when evaluated, matches one of the attribute values shown in the right-hand column in the discipline table. For example, an :MMSDISC value of 'P' would normally correspond to the 'P' set as the attribute of discipline 'Piping'. Clash Manager will search for the attribute on the clashing item, and if not found there, will search the owning hierarchy for it.

If a match is found then that discipline is associated with the clashing element, otherwise the clash is assigned to a default discipline selected from the Default drop-down list. If a clashing element does not match any of the specified values then it is set to a special discipline called ‘UNALLOCATED’.