 Control delimiters, the basis of delimited continuations, were introduced by Matthias Felleisen in 1988 though early allusions to composable and delimited continuations can be found in Carolyn Talcott's Stanford 1984 dissertation, Felleisen and Friedman's PARL 1987 paper, and Felleisen's 1987 dissertation.Delimited continuations were first introduced by Felleisen in 1988 with an operator called formula_1, first introduced in a tech report in 1987, along with a prompt construct formula_2.The operator was designed to be a generalization of control operators that had been described in the literature such as codice_1 from Scheme, ISWIM's J operator, John C. Reynolds' codice_2 operator, and others.