The main idea of this article Head Injuries in the NFL, written by Jim Dave of the Boston Globe, is to inform readers about the precautions taken by the NFL to make American football a safer place to play. It's pretty clear of the author's purpose because I wasn't able to pick up any persuasion techniques.
The author's viewpoint is that head injuries, including concossions, particularly in the game of American football, have become a subject of deep concern. For instance, he uses three studies, including one by the University of Michigan and one by the University of North Carolina, all supporting his viewpoint. The study done by North Carlolina states that of 595 retired NFL players with three or more concussions, 20.2% said they had been found to lead to depression. The Michigan study stated that Alzheimer's disease appear to have been diagnosed in the league's former players vastly more often that in the national population.
He has some some conflicting evidence when he states that "the NFL and its medical committee on concussions have steadfastly denied the existence of reliable data on the issue," but throughout the piece he is leaning towards one side. I think I can rely on the article considering he has most of his information from studies studies done by two Division 1 colleges, proving its credibility.
Overall the source is reliable, giving me the information I needed about the topic.
http://topics.nytimes.com/top/reference/timestopics/subjects/f/football/head_injuries/index.html
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