Bad grammar - how bad is it, really?

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As we explore the nature of linguistic communication in this week's chapter, the topic of grammatical relevance inevitably surfaces. How important is it to know the difference between its and it's or they're, their and there? 

In his irreverent post for the Harvard Business Review blog, Kyle Wiens, CEO of iFixit, discusses the importance of grammar in the workplace. He ends the article by saying, "That’s why I grammar test people who walk in the door looking for a job. Grammar is my litmus test."

What do you think? Share your thoughts here.