Samuel, a human resource $($HR$)$ professional, plans to implement a performance appraisal system for his firm. Which of the following should he ensure to have an effective appraisal outcome?$$

Multiple select question.

He should ensure that raters are trained to operate the appraisal system.

He should ensure that raters focus on the person instead of the behavior while evaluating employee performance.

He should ensure that raters keep a diary of employee performance for documentation and to jog their memory.

He should ensure that raters avoid having any informal discussions with their ratees about progress.