Answer: Primacy effect or first impression
Explanation:
A good manager should be objective about the performance of their employees and it goes without saying that employees expect their performance appraisals to be fair and free of biases.
In general , the primacy effect or first impression ,managers would form an impression about the employee on the basis of some particular characteristics of the employee identified by them. Here the initial impression influences the decision on the year end appraisal irrespective of whether the employee has been able to keep up the initial impression or not. The bias could be either positive or negative.
An example of this would be a new employee messing up their first project but performing exceedingly well in all projects afterwards.