There are several barriers that prevent Brazilian citizen to access knowledge, including the way in which computational technology is presented considering the diversity of interaction skills in our population. One approach for suiting the diverse and mutable interaction requirements is to tailor interfaces according to the users' preferences or needs. Although literature regarding tailoring presents results with diverse foci, there has been a lack of works considering methods and techniques to support designers in their practice. This paper presents a practical approach to elicit and formalize the tailorable behavior making interactive systems more flexible. The elicitation of the different possible interfaces is performed with users' participation and the tailorable behavior is formalized with a norm-based structure. 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