In some jurisdictions, an assessor is a judge's or magistrate's assistant. This is the historical meaning of this word.
In common law jurisdictions, assessors are usually non-lawyers who sit together with a judge to provide either expert advice (such as on maritime matters) or guidance on local practices. The use of assessors nowadays is quite rare. In some jurisdictions, such as Fiji, assessors are used in place of juries. An assessor's opinion or view of a case is not binding on a judge.
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A lay judge, sometimes called a lay assessor, is a person assisting a judge in a trial. Lay judges are used in some civil law jurisdictions. Lay judges are appointed volunteers and often require some legal instruction. However, they are not permanent officers. They attend proceedings about once a month, and often receive only nominal or "costs covered" pay. Lay judges are usually used when the country does not have juries. Lay judges may be randomly selected for a single trial (as jurors are), or politically appointed. In the latter case they may usually not be rejected by the prosecution, the defense, or the permanent judges. Lay judges are similar to magistrates of England and Wales, but magistrates sit about twice as often.
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