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In pro per: One who is not represented by an attorney.

Independent contractor: Some employers classify employees as an independent contractors to avoid workers' compensation. If your employer controls the manner of your work, has the right to terminate you, pays you an hourly wage or salary, requires you to work a specific schedule and makes deductions for Social Security or unemployment, then you are likely NOT an independent contractor. 

Impairment rating: A percentage estimate of how much normal use of your injured body parts that you have lost. Impairment ratings are based on guidelines published by the AMA.