This volume offers a comprehensive survey of the methods used to determine the authenticity of paintings, combining traditional art-historical criteria with advanced scientific and technical analyses. Marijnissen outlines the principles and procedures applied in the examination of artworks, including material analysis, radiography, microscopic inspection, pigment and binder testing, and infrared and ultraviolet imaging. The book also addresses stylistic evaluation, provenance research, and historical documentation as integral components of authentication. Throughout the work, detailed case studies illustrate how these investigative approaches converge to reveal fraud, detect restoration, identify workshop participation, and differentiate genuine works from modern forgeries. The result is a multidisciplinary framework that reflects the evolving standards of connoisseurship and technical art expertise.