appraisals occur between managers and their subordinates whenever the need to discuss ongoing progress and areas for improvement arise.

Informal

Explanation:  appraisals that occur between managers and their subordinates whenever the need to discuss ongoing progress and areas for improvement arise is known as an informal appraisal. Here, a manager provides significant feedback and direction to his employees outside of a formal review meeting thus providing opportunities for coaching and rapport building. It is carried out whenever the manager or supervisor deems it necessary.

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