The range or scope of something is its purview. If you are a professional race car driver, performing surgery is way outside your purview.

Anything inside a range of interest or activity is within a purview. A supervisor is in charge of certain workers — other workers are outside her purview. The surgeon general deals with medical issues: the defense budget is outside his purview. When a business expands, it's trying to increase its purview. If you go to the dentist and ask her to paint a picture of your tooth rather than extracting it, you're likely to discover you've gone way beyond her purview.

Definitions of purview
  1. noun
    the range of interest or activity that can be anticipated
    synonyms: horizon, view
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    type of:
    ambit, compass, orbit, range, reach, scope
    an area in which something acts or operates or has power or control: "the range of a supersonic jet"
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