in a standard bipartite bell experiment, alice’s (bob’s) setting formula_29 (formula_73), together with her (his) local variable formula_31 (formula_32), influence her (his) local outcome formula_13 (formula_77). bell’s theorem can thus be interpreted as a separation between the quantum and classical predictions in a type of causal structures with just one hidden node formula_78. similar separations have been established in other types of causal structures. the characterization of the boundaries for classical correlations in such extended bell scenarios is challenging, but there exist complete practical computational methods to achieve it.