Interpreters are required to:

• Only accept assignments for which they are qualified
• Faithfully convey messages as accurately as possible
• Maintaining confidentiality about all aspects of the assignment
• Remain impartial
• Conduct themselves in a professional manner
• Respect both clients and colleagues
• Commit to ongoing training and development of their interpreting skills

http://carolafinch.hubpages.com/hub/Characteristics-of-Effective-Sign-Language-Interpreters 11092015