Background to the Study 

Thank you Mr. for your interesting video. I have one question. Somewhere in your video (may be at the begining of the 3rd menutes ) you said background should be supported by the general knowlege not by results of previous studies. But, how could it be possible for a researcher to talk about the issue globally, regionally and nationally without having any recent results about the issue? By what evidence can he show the prevalence of the problem?

Thank you ,, i just wished if there is an example , and the way of how to write it .