Endowing an autonomous system like a robot with intelligent behavior is a difficult problem for several reasons. First, behavior is such a wide topic that a general framework paradigm of inspiration must be chosen in order to obtain a consistent model. Such a framework can be for example biological modeling or an artificial intelligence approach. Second, a general framework is not sufficient to determine a fully specified program to be implemented in a robot. Many choices, tuning and tests must be carried out before obtaining a robust system. This paper describes this.