This paper sketches some of the issues involved in designing user interfaces to interactive graphics systems. The ideas are presented and motivated through a series of examples that arise in an interactive graphical editor for musical scores expressed in common music notation. LA F ACILIT ATION DES ACTIONS A VEC DES SYSTEMES GRAPHIQUES: QUELQUES EXEMPLES QUE VIENNENT DE LA COMPOSITION MUSICALE A L'AIDE DE L'ORDINATEUR Resume Cette communication traite de quelqu'unes des solutions que se presentent cl I'egard de la construction des interfaces pour I'usager d'un systeme graphique interactif. Les idees se sont presentees et inspirees au moyen des questions que se sont posees en ce qui conceme un editeur graphique interactif pour les partitions exprimees cl la notation commune de musique.
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