In the first part of the paper, the syntac- tic tree model which is commonly used to represent a text is turned into a hierarchical model of communicating objects. This lat- ter model is more flexible; it makes the de- sign easier as well as it allows introduction of new potentialities to the editor. These two features are due to the autonomy of each object. It is therefore not necessary to explicit the global behaviour of the ap- plication: the functioning results from the cooperation between objects exchanging in- formations throught links. The second part presents an example of implementing the model proposed in the first part with the use of the ADA task- ing mechanism; the interests and limitations of this solution are then discussed. Lastly, the limitations encountered above are sup- pressed by the use of the Object-Oriented Language LERNE.