The Abstract is an important element of the thesis, and will become a document in its own right if the thesis is registered within any database.
The examiners will therefore assess your Abstract both as part of your thesis, and as a potentially independent document.
This may be one of the shortest sections of your thesis or dissertation, but it is worthwhile taking great care to write it well.
Essentially, the Abstract is a succinct summary of the research.
It will also provide you with a framework to refer back to in your discussion chapter, when you reflect on the extent to which your research has achieved what it set out to do.
In these chapters a straightforward description is required of how you conducted the research.
“I know I’m good at writing so I can leave it to later”.
“I want to get everything sorted out in my mind before I start writing or I’ll just end up wasting my time re-writing”.
It is certainly an academic exercise, but perhaps not too different from the concise explanations of your research you may have had to give to relatives and neighbours over the last few years, in terms of its brevity, accessibility, and comprehensiveness.
This is your opportunity to mention individuals who have been particularly helpful.