At the present, the C3B list is informally maintained by consensus of the callers of that program.
At the C4 level callers are generally free to use any call or concept they please (subject only to the patience and knowledge of their dancers), but efforts are made to collect and standardize those calls and concepts used by practising callers.
[citation needed] There are also several lower-level programs promoted by groups other than Callerlab.
Other groups of callers advocate even smaller lists to reduce the barrier to new people getting involved.
Having managed program lists allows modern western square dance to be an international activity.