In an experimental system, a periodically driven bronze ribbon, we compare the feasibility of three methods for the control of instable periodic orbits in chaotic systems. We further investigate the influence of time-variing system-parameters. (orig.)Available from TIB Hannover: F97B573+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman