http://www.sil.org/~gaultney/ProbsOfDiacDesignLowRes.pdf Problems of diacritic design for Latin script text faces. (Diacritics are accents, umlauts, and so forth.) A fascinating 30-page thesis detailing the difficulties involved in designing a multi-lingual typeface. Does the dot over the i harmonise with the two dots over the ï? What happens when a î is set next to a f? How should diacritics be aligned?