In his doctoral thesis, Willi examines a variety of topics from his given method--examining linguistic variations in given data sets of Attic Greek. These include comparisons both of Aristophanes and other extant Attic Greek authors, as well as within different plays of Aristophanes. The work, as you can imagine, makes use of many technical terms. Willi also has a habit of casual inserting German and French passages and leaving them untranslated. The thesis is therefore forbidding; however, I do commend Willi for a very illuminating study of Old Comedy. Most importantly, Willi rather casually attaches a simple grammar of Aristophanic Greek as an appendix to the thesis. This is an incredibly useful tool for me, as a student approaching Aristophanes for the first time. I dare admit that it meant more to mean than the thesis itself.