Abstract
The modelling of believable synthetic characters allows analogies with subjects from areas like Biology and Psychology. So, the modelling of synthetic characters might consider the question of survival in living organisms. Based on survival, appear many homeostatic variables that define the balance of an organism. The lack of balance of an organism requires its regulation and interferes with the way of life. A synthetic character might also have homeostatic properties that define its balance on its way of life reacting to the lack of balance of those properties using planning or recurring to known behaviours, seen as preferential, ie, useful behaviours to achieve goals that can increase or decrease its strength over time, in several circumstances. Regarding the second one it is possible to say that it is the concept of habit. If the character can adapt to the environment where acts and demonstrate a behaviour that allows an external observer to detect habits on its behaviour, is believed that the level of credibility might increase. Therefore, it is proposed a model to the adoption of habits from the synthetic characters that assumes certain premises in order to be implemented on architecture for synthetic characters and considers, for example, the behaviour's success level and the circumstances in that are taken. The model was later implemented on architecture for synthetic characters and evaluated. From the evaluation is it possible to conclude that the model is adequate so that external observers detect habits on the characters and, sometimes, even increase its credibility.