Abstract: A programmable interface contactor structure including a plurality of discrete electrical probes geometrically arranged, or oriented, to respectively electrically contact a discrete one of an array of conductive pads on a device under test. The plurality of discrete probes are contained and supported within a structure having a generally planar exposed upper surface where one end portion of each of said plurality of probes is electrically connected to a single conductive pad contained within an array of pads on said planar surface of the probe assembly. The contactor structure further includes a space transformer having a generally cylindrical overall configuration.