1- compare between long and short vowels in arabic.
2- a spectrographic analysis of arabic vowels.
3- Formant readings from Praat program.
4-Formant based analysis.
5- should add some spectrogram pictures for what it measuring.
6- Doing some kinds of phonetic measurements for the vowels .
7-you can compare the arabic vowels with the English one.
8- measuring the duration of long vowels in comparison to short vowels.
9- a literature survey and original research.