Your reader (and examiner) will thank you, because they'll be able to understand exactly what your study is about just from reading the introductory pages.
Keep this guide to hand, whatever stage of the writing process you are at.
To write the proposal, you need to follow this structure: The data and information you obtained during your research must be placed right in the dissertation structure.
This stage should create an outline of the writing you will perform.
The point of writing a dissertation is to show the capacity and skills in the form of research and writing, all in the discipline you chose to pursue.
It is a step by step process that leads to original and highly valuable project for the scientific and academic community.
Think of a newspaper article: the first couple of paragraphs provide a brief overview of the story. On the flip side, some students don't provide enough detail.
The danger here is that the reader is left asking questions at the end of the introduction.
Sure, you will need to situate your study in a body of literature, but the introduction isn't the place to critically discuss it or justify its inclusion in that literature.
It's enough to say that you will contribute to X body of literature and briefly discuss its core features and shortcomings.