Working conditions are usually specified in an employment contract, in accordance with labour law and international labour regulation.
"Minimum standards for
working conditions are defined in each country but the large majority of workers, including many of those whose conditions are most in need of improvement, are excluded from the scope of existing labour protection measures.
[…]
Many ILO standards are applicable to these unprotected workers and the ILO has considerable information on their
working conditions problems."
(International Labour Organization,
Working Conditions, 2007, visited 2010-11-03)