There are opportunities to combine these sections to best suit your needs.
There are also opportunities to add in features that go beyond these four points.
You are going to want to begin outlining your background section by identifying crucial pieces of your topic that the reader needs to know from the outset.
A good starting point might be to write down a list of the top 5-7 readings/authors that you found most influential (and as demonstrated in your literature review).
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.
History Dissertation Examples
The reader needs to know your research is worth doing.
In terms of length, there is no rule about how long a dissertation introduction needs to be, as it is going to depend on the length of the total dissertation.
Generally, however, if you aim for a length between 5-7% of the total, this is likely to be acceptable.
While this is certainly an important element to any research project, and to the sanity of the researcher, the writing in the dissertation needs to go beyond ‘interesting’ to why there is a particular need for this research.
This can be done by providing a background section.