3. Proficiency testing

3.1 Objectives and principles

Table  1 indicates that proficiency testing is another type of collaborative study. In terms of vocabulary, the expressions laboratory intercomparison , or ILC, and proficiency testing , or PT, often come across.

For a long time, PTs were simply collaborative tools, used on a voluntary basis by scientists to develop a common method. With the introduction of ISO/IEC 17025 accreditation , they...