Abstract : Interactivity, crucial notion introduced by computerization of information and communicatio processings, changes drastically the user's behaviour with applications turned into media event. If a conventional motion-picture offered only one pictures editing, an interactive application allows a lot of editings (associations of elements), not determined beforehand. This general principle could be applied for wide ranges of concrete realisations, from a choice of linear way to virtual worlds evolutions. This article suggests a principle of classification for interactive processes, determined by levels from (0,0) to (5,2). It is based on recognition of different sorts of datas (depending on three item: fixed, progressive, générative) and on establishing the document datas structure type.