Time domain reflecometry (TDR) was originally developed to find breaks in power and communication cables. When a coaxial cable is deformed, the impedance characteristics of the cable change. Changes in impedance are noted as changes in the characteristic TDR signature of the cable. This technology has been adapted to monitor slope and embankment movements. Coaxial cables were placed in boreholes and slope movements monitored remotely by a cable tester and computer at the site or by using a data logger and cellular phone. Four sites in California were monitored using TED and the data compared with conventional inclinometer monitoring. Results showed that TDR can reliably determine the depth and location of shear planes. The advantage of TDR are that 1. cumbersome equipment need not be brougth to or maintained at the site to monitor movement, 2. slope monitoring can be done from any location with a modem and computer and 3. installation and monitoring can be economically accomplished.