Retraining or refresher training is the process of learning a new or the same old skill or trade for the same group of personnel. Retraining is required[by whom?] to be provided on a regular basis to avoid personnel obsolescence due to technological changes and the individuals' memory capacity. This short-term instruction course shall serve to re-acquaint personnel with skills previously learnt or to bring their knowledge or skills up-to-date so that skills stay sharp. This kind of training could be provided annually or more frequently as maybe required, based on the importance of consistency of the task of which the skill is involved. Examples of refreshers are cGMP, GDP, HSE trainings. Retraining shall also be conducted for an employee, when the employee is rated as 'not qualified' for a skill or knowledge, as determined based on the assessment of answers in the training questionnaire of the employee.