This document discusses the root locus technique for analyzing control systems. It describes the 7 step procedure for constructing a root locus plot: (1) locate poles and zeros, (2) determine the real axis path, (3) find asymptote angles, (4) identify breakaway points, (5) calculate departure and arrival angles, (6) find imaginary axis intersections, (7) sketch the root locus using test points. The root locus technique allows observing how closed-loop poles move in the s-plane as the system gain varies, helping to achieve desired performance.