Русско-англо-русский юридический словарь

Retraining or refresher training is the process of learning a new or the same old skill or trade for the same group of personnel. (Wikipedia)

Refresher training is an aspect of retraining taken by a person already qualified or previously assessed as competent in a field with the intention of updating skills and/or knowledge to a changed standard, or providing the opportunity to ensure that no important skills or knowledge have been lost due to lack of use. (Wikipedia)