Slides of to accompany a presentation given at the Indo-European Seminar at the Faculty of Classics, University of Cambridge on February 17th 2016. The presentation addressed recent arguments made about the phylogenetic subgrouping of the Ancient Greek dialects and proposes an alternative model of analysis, introducing for the first time a methodology of a Probability-based Clade Test to test the likelihood of the independent innovation of isogloss bundles shared between Ancient Greek dialect groups.