  Most questionnaires offer ordered responses whose order is poorly studied via
belief functions. In this paper, we study the consequences of a frame of
discernment consisting of ordered elements on belief functions. This leads us
to redefine the power space and the union of ordered elements for the
disjunctive combination. We also study distances on ordered elements and their
use. In particular, from a membership function, we redefine the cardinality of
the intersection of ordered elements, considering them fuzzy.
