The recent interest in the area of the control of chaos is remarked an
d the various approaches to this problem presented in the literature a
re briefly summarized. The Harmonic Balance (HB) technique for the app
roximate analysis of systems with complex behaviour is outlined and th
e general idea of using this technique for control problems is propose
d. Two possible approaches are indicated to show the flexibility of th
e method, the clearness of the required conditions and the simplicity
of the solutions to be expected.