At the beginning there was clearly a word. And also this word is "concept". With the concept of a dissertation if you still do not know where to start your work on your manuscript, start it.
For people who order a dissertation during the agency I will say individually. The idea of the dissertation is some sort of guarantee that you'll have an even more or less service that is high-quality. If during the phase of signing the contract to you personally nobody within the agency can plainly and distinctly substantiate the job, the dissertation will never be.