The Trade Workers Registry (TWR) is a registry of skilled trade workers. We list people of all trades:

• blue collar (workers in manufacturing, mining, building and construction trades, mechanical work, maintenance, repair and operations maintenance, or technical installations);
• grey collar (workers in farming, fishing, forestry, food preparation and catering, security, health care, skilled trades, hi-tech technicians);
• green collar (workers in organic farming, conservation, environmental, alternative health care, or renewable energy fields);
  
• service sector (workers involved in customer interaction, entertainment, retail and outside sales);
• white collar (salaried professionals or educated workers who perform semi-professional office, administrative, and sales coordination tasks);
• gold collar (highly-skilled knowledge workers such as lawyers, computer programmers, stock analysts, community planners, editors and engineers).
  

Some basic trades vocabulary: an apprenticeship is a way of learning a skilled trade from a professional tradesperson, also called a journeyperson. An apprentice may earn a Certificate of Apprenticeship, which is the document showing that he/she has successfully completed his/her apprenticeship. A Certification of Qualification is a document that is obtained when a written exam is completed and passed with a minimum passing mark or grade. The Certification of Qualification often identifies a journeyperson.

Please note that in many countries there are restrictions as to who may or may not practice a certain trade. In many instances, only registered apprentices or licensed (certified) journeypersons may pratice in a certain trade. Regulations vary from country to country, but there are some common rules.