One of the first times in which Jean-Paul Sartre discussed the concept of situation was in his 1943 Being and Nothingness, where he famously said that
Earlier in 1939, in his short story The Childhood of a Leader, collected in his famous The Wall, referring to a fake turd, he said that in pranks "There is more destructive power in them than in all the works of Lenin."
Another famous use of the term was in 1945, in his editorial of the first issue of Les Temps modernes (Modern Times); arguing the principle of the responsibility of the intellectual towards his own times and the principle of an engaged literature, he summarized: "the writer is in a situation with his epoch."
An, influential use of the concept was in the context of theatre, in his 1947 essay For a Theatre of Situations. A passage that has been frequently quoted is the following, in which he defines the Theater of Situations:
He then published his series Situations, with ten volumes on Literary Critiques and What Is Literature? (1947), the third volume (1949), Portraits (1964), Colonialism and Neocolonialism (1964), Problems of Marxism, Part 1 (1966), Problems of Marxism, Part 2 (1967), The Family Idiot (1971-2), Autour de 1968 and Melanges (1972), and Life/Situations: Essays Written and Spoken (1976).