 Modal Criterion holds in the views put forward in Wittgenstein TLP, Suszko 1968 and Fine 1982 (in theories F(A)-Cond and C-Cond). It does not hold in Fine’s theory F-Cond (Fine 1982) and Zalta’s theory (Zalta 1991), under the two interpretations indeed. References relative to previous principles will be given later on. More detail is available in the  supplementary document on Some Formal Theories in the Literature.