The charter doesn't indicate who decided which is appropriate. Presumably Harald and Leslie?
Hmm, this seems confusing to me, and perhaps another reason why other SDOs are having a hard time communicating with IETF. If neither body has sole responsibility for appointing liasons, then there is no group/individual with a map of who is talking to what group, and therefore in a position to help faciliate the communication when things go off track. I wonder if there is any way this could be simplified without putting in place a heavy weight process? Or perhaps there is some informal process in place that I'm not aware of?