Competence is the ability to do something at the expected level of performance. Demonstrating ability and competence in a subject field is a mandatory element of effective expert testimony. Experts demonstrate competence by:   

• Having a thorough knowledge of the field, subject or specialty.
• Having appropriate experience or credentials, or both.
• Presenting a currency of information.
• Showing that they have the ability to perform as well as teach.
• Demonstrating results.
• Showing an ability to recognize problems, elect alternatives, and make good choices among them.

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