In this paper we summarize the results of recent measurements of thehigh confinement mode (H-mode) edge transport barrier in Alcator C-Mod. Anumber of new, high-resolution edge diagnostics provide measurements of plasma parameters (electron density and temperature, and impurity density)in the pedestal region. Pedestal parameters are measured both at the top edgeof the plasma and at the midplane. Very narrow (2-5 mm) electron density andtemperature and impurity density pedestals are observed. The impurity pedestalis located inside the density and temperature pedestals in the midplanemeasurements, but coincides with the ne pedestal at the top edge.Correlation of both width and height of the pedestals at the midplane withglobal plasma parameters and core confinement characteristics isobserved.At the same time there are no clear indications of scaling for the electrondensity and impurity pedestal widths measured at the top of the plasma.