It is generally considered inappropriate to simply state the context and focus of your study and what led you to pursue this line of research.
The reader needs to know your research is worth doing.
For example, some students like to add in their research questions in their dissertation introduction so that the reader is not only exposed to the aims and objectives but also has a concrete framework for where the research is headed.
Other students might save the research methods until the end of the literature review/beginning of the methodology.
Again, you want to ease the reader into your topic, so stating something like “my research focus is…” in the first line of your section might come across overly harsh.
Instead, you might consider introducing the main focus, explaining why research in your area is important, and the overall importance of the research field.
One key point to remember is that your research focus must link to the background information that you have provided above.
While you might write the sections on different days or even different months, it all has to look like one continuous flow.
Once you have identified these, write some brief notes as to why they were so influential and how they fit together in relation to your overall topic.
You may also want to think about what key terminology is paramount to the reader being able to understand your dissertation.