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Effective communication - clear concise; focus on communicating your ideas very effectively with a minimum number of words.
Challenge; take any of your college assignments, re-do them with a MAXIMUM of 500 words. Ask a friend that is not very knowledgeable in the field to review it - do they completely understand what you are trying to communicate?
Consultants are hired for their expertise in a specific subject. You have to convince someone who knows a little about the subject that you know a lot in an extremely short time period.
What is your area of expertise? Why should I hire you?