Other notations have been proposed by researchers.,<ref>{{cite journal |author=Rolland, Colette | coauthors=Prakash, Naveen, Benjamen, Adolphe | title=A Multi-Model View of Process Modelling | journal=Requirements Engineering | year=1999 | volume=4 | issue=4 | url=http://hal.archives-ouvertes.fr/docs/00/70/75/68/PDF/A_multi_model_view_REJ.pdf}}</ref> while the Goal Structuring Notation (GSN) is used to make [[safety case]]s to satisfy the regulator in safety-related industries.<ref>[http://www.goalstructuringnotation.info GSN Community Standard]</ref>
