Use when you must locate the shear center of a thin-walled open section under transverse shear: walk the contour from the free edge accumulating the first moment Q, build the V*Q/I shear-flow distribution, integrate the wall-shear resultant and its moment, and report the shear-center offset from the web, centroid or corner in millimeters for channel, Z, angle, hat and slit single-cell box sections, with the bending shear-stress check tau = V*Q/(I*t) at the critical wall station.
