What would the media richness literature say about his choice of medium?

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Mark, the managing partner of AJG Accounting Firm is sitting in his office when the phone rings. It is Jennifer, the CEO of Blair’s Construction, which is an 80-million-dollar construction company that Mark’s company recently acquired as a client. She asks Mark, “Thought you said your auditor had questions for me this morning. I have been in my office all morning and he has not come by yet.” Mark assures her that the auditor is on her property and that he will get in touch with his auditor to see what is the issue.
Mark calls his auditor, Michael, and asks “Why have you not communicated with the CEO yet? I told you she was only available for the morning.” Michael responds by telling Mark that he e-mailed her about two hours ago and has not heard from her. Mark tells Michael to hang up the phone and go see Jennifer in her office. Michael reluctantly agrees.
Question 1: Where did the communication process breakdown here?
Question 2: Was Michael in the wrong in this situation? What would the media richness literature say about his choice of medium?
Question 3: What could Mark do to ensure that this type of communication problem does not happen in the future?

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