Advancements in Optical Methods, Digital Image Correlation & Micro-and Nanomechanics , Volume 4 of the Proceedings of the 2022 SEM Annual Conference & Exposition on Experimental and Applied Mechanics , the fourth volume of six from the Conference, brings together contributions to this important area of research and engineering.  The collection presents early findings and case studies on a wide range of optical methods ranging from traditional photoelasticity and interferometry to more recent DIC and DVC techniques, and includes papers in the following general technical research areas:   DIC Methods & Its Applications Photoelsticity and Interferometry Applications Micro-Optics and Microscopic Systems Multiscale and New Developments in Optical Methods Extreme Nanomechanics In-Situ Nanomechanics Expanding Boundaries in Metrology Micro and Nanoscale Deformation MEMS for Actuation, Sensing and Characterization 1D & 2D Materials