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This paper targets with applications running on mobile devices. We aim at developing a formalism and a framework to simplify the development of applications taking into account the context in which they are running, whatever this context may be. Following previous studies from other authors, we extend the notion of context area using distance function with cost function on context space dealing on different modes of selection. We extend the context area formalism to encompass more applications. We demonstrate on a mobile applications: the museum visit.