The plasma physics literature abounds with theoretical expressions for anomalous transport coefficients (see the earlier review by Liewer [1]) purporting to explain the confinement properties of tokamaks, often on the basis of crude comparisons at the level of energy confinement time scalings. The availability of spatially resolved measurements of most plasma parameters in present-day tokamaks allows a more detailed and stringent assessment of theoretical transport models, based on comparisons with local heat fluxes and transport coefficients inferred from the experimental data.