10 Rating Errors to Avoid During Performance Reviews

1.	Bias	A.	Letting one positive work factor you like affect your overall assessment of performance.
2.	Recency	B.	Overlooking the flaws of favored or "nice" employees.
3.	Grouping	C.	Rating everyone high, regardless of performance, to make yourself look good or to be able to give more compensation.
4.	Favoritism	D.	Rating someone on the basis of the company they keep, rather than on the work they do.
5.	The Halo Effect	E.	Excusing below-standard performance because "everyone does it."
6.	Central Tendency	F.	Allowing your attitudes and opinions about race, national origin, etc. to influence rating.
7.	Holding a Grudge	G.	Rating only recent performance, good or bad.
8.	The Horns Effect	H.	Making employees pay for past behavior.
9.	Guilt by Association	I.	Clustering everyone in the middle performance categories to avoid extremes of good or bad performance.
10.	The Sunflower Effect	J.	Letting one negative work factor or behavior you dislike color your opinion of other factors.