NZSTI is a nationally representative body of translators and interpreters that provides a networking forum for its members, represents members' interests, and promotes continued professional development, quality standards and awareness of the profession within government agencies and the wider community.nThe NZSTI is formally affiliated with The Sign Language Interpreters Association of New Zealand (SLIANZ). SLIANZ is a national professional association which aims to represent and advance the field of sign language interpreting.