Conference Interpreter (Senior) (formerly known as Level 5): This is the highest level of NAATI interpreting accreditation. It reflects a level of excellence in conference interpreting, recognised through demonstrated extensive experience and international leadership. It encompasses and builds on the competencies of Conference Interpreter accreditation.

Conference Interpreter (formerly known as Level 4): This represents the level of competence required to handle complex, technical and sophisticated interpreting, in both consecutive and simultaneous modes, in line with recognised international practice. Conference Interpreters operate in diverse situations, including at conferences, high-level negotiations, and court proceedings and may choose to specialise in a particular area(s).

Professional Interpreter (formerly known as Level 3): This represents the minimum level of competence for professional interpreting and is the minimum level recommended by NAATI for work in most settings, including banking, law, health, and social and community services. Professional Interpreters are capable of interpreting across a wide range of semi-specialised situations and are capable of using the consecutive mode to interpret speeches or presentations.

Paraprofessional Interpreter (formerly known as Level 2): This represents a level of competence in interpreting for the purpose of general conversations. Paraprofessional Interpreters generally undertake the interpretation of non-specialist dialogues. Practitioners at this level are encouraged to obtain Professional-Level accreditation.

(Extract from Outlines of NAATI Credentials, 2010)