1. A method executed on a computer for generating a vocal interface code for a software application having the data described with an entity-relationship model comprising classes, class attributes and relations between classes, said method comprising: for each class read from the entity-relationship model, identified as being neither a class used for an interface of the software application nor an abstract class, creating a structure of a dialog unit code for acquisition of values for the attributes of the class; for each attribute of the identified class read from the entity-relationship model, if the class has a single relationship to one other class or if the class has a multiple relationship to other classes but the multiple relation does not apply to the attribute, creating in the dialog unit code, code for a direct acquisition of value for the attribute else, creating in the dialog unit code, a sub-dialog code for enabling selection of a dialog unit code of the other classes; and identify if the created form is an entry form or an internal form by reading the relationships associated to the class in the entity-relationship model.