In his famous German paper “Juristische Schlüsse a fortiori und a pari” from 1965, Alchourron developed a model for analogies taking into consideration different types of legal rules. Taking this as a starting point we develop a formal model going deeper into jurisprudence by referring to balancing interests. This model deals with analogies based on a-fortiori-arguments, a-pari-arguments and a-simile-arguments.