  In this letter we show that the field of Operator Space Theory provides a
general and powerful mathematical framework for arbitrary Bell inequalities, in
particular regarding the scaling of their violation within quantum mechanics.
We illustrate the power of this connection by showing that bipartite quantum
states with local Hilbert space dimension n can violate a Bell inequality by a
factor of order $\frac{\sqrt{n}}{\log^2n}$ when observables with n possible
outcomes are used. Applications to resistance to noise, Hilbert space dimension
estimates and communication complexity are given.
