What to mention in your introduction to your research methodology chapter My supervisor told me that I should write paragraph in which I introduce the problem that will be addressed by this chapter (research methodology). 

What are some of the key aspects I should focus on? I understand that it cannot be a too detailed description, as my supervisor recommends only a single paragraph but I also do not want to write too little.
Answer this question in less than one minute, assuming that I have the basic knowledge of your area:
What is your research about?

Than add these in less than two minutes:
Why did you do your research in that specific topic? What is your innovation?

Lastly,
How did you do it?

Now, write your answers on a paper. And that would be the intro.
Edit: Commentors are right. Only the last part would be an intro for methodology.