There is no internationally agreed definition of a less or low skilled and semi-skilled migrant worker. In broad terms, a semi-skilled worker is considered to be a person who requires a degree of training or familiarization with the job before being able to operate at maximum/optimal efficiency, although this training is not of the length or intensity required for designation as a skilled (or craft) worker, being measured in weeks or days rather than years, nor is it normally at the tertiary level. Many so-called “manual workers” (e.g. production, construction workers) should therefore be classified as semi-skilled. A less or low-skilled worker, on the other hand, is considered to be a person who has received less training than a semi-skilled worker or, having not received any training, has still acquired his or her competence on the job.