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This Technical Report revises ISO/TR 19319:2003 - Surface chemical Analysis-Auger electron spectroscopy and X-ray photoelectron spectroscopy-Determination of lateral resolution, analysis area and sample area viewed by the analyser. The revised Technical Report gives a short introduction to basic models of image formation and introduces functions which characterize the performance of imaging instruments with respect to lateral resolution and sharpness. The determination of lateral resolution by imaging of square-wave gratings and the determination of sharpness by imaging of narrow stripes and straight edges are described in detail. Finally, physical factors affecting lateral resolution, analysis area and sample area viewed by the analyser are discussed.