Well, you will have many questions to answer concerning about your dissertation.Teacers tend to give you questions of the main idea of the thesis.And ask you to explain some of terms and tectics used in the cases you write. They will also question whether your dissertation can be used in reality . As a matter of fack,teachers will have questions for you in line with the policy of your school. So ,I suggest that you get familiar with your essay .They will probably ask any parts of your dissertation. Well,I'd like to exmplify the regulations of dissertation defence in SHJT Continued Education college .First phase:Brief self - introduction and say hello to teachers.Second phase:narrate what you write in 3 minutes without scripts . Third phase: Teachers ask you questions by turn. The most important stage is don't carry a script and read it because you will never be allowed to read a script. If don't keep the regulations of the school ,you will totally be a loser. Good luck to you. Put more on steam.