In this paper, we propose that the contexts of fortition and lenition can be represented with a very simple autosegmental tool: branching. We point out a major shortcoming of Coda Mirror Theory: though this model tries to account for strength with lateral relations, length should also be factored in order to account for the inalterability of geminates. In order to unify the principles that regulate strength, we propose a consistent theory built exclusively on length, without lateral relations.