" The questionnaire is based on the Stiebels’ (2007) definition of obligatory control:
(1) Definition of obligatory control:
Obligatory control applies to structures in which a predicate P1 selects a SOA-argument and requires one of its (individual) arguments to be (improperly) included in the set of referents of an argument of the embedded predicate P2 heading the SOA-argument." (Stiebels, 2007: 1)
It can be found as an appendix in Barbara Stiebels (ed.). 2007. Studies in Complement Control. ZAS Papers in Linguistics 47, 1-80.