TL;DR: In this paper, an interactive method is presented, which requests only ordinal comparisons from the decision maker, where the relation "more important than" is assumed to be a semi-order.
TL;DR: In this article, two types of real interval representations for interval orders and semi-orders are discussed: the first model is: x ≺ y iff a b for all a in F ( x ) and all b in F( y ).