The paper concerns the acoustic realization of some selected boundary types in Italian. Scope of the paper is to investigate whether the concept of boundary magnitude is applicable to Italian and to study the relationship between duration and F0 as boundary signals. The data on three subjects indicate that within-phrase boundaries are usually not signalled, while for between-phrase and between-clause boundaries both the temporal pattern (the duration of the temporal interval between onset of the domain-final syllable and onset of the domain-initial syllable) and the type of the F0 contour are clear indexes of the degree of cohesion/separation between the units. The present data seem to suggest a priority of the function of F0 as a boundary signal over its function as a stress correlate.