Normally when I am asked to write a reference for someone who was poor I simply state: <<Name>> worked at X from <<date>> to <<date>>. His/Her role was th

Normally when I am asked to write a reference for someone who was poor I simply state: <<Name>> worked at X from <<date>> to <<date>>. His/Her role was that of <<position>> and had responsibility for <<responsibilities>>. He/she led a team of <<number>>. If the person was good, I'll state it explicitly. I expect the new potential employer to read from what I didn't say when it comes to someone that was not particularly good. Does anyone else do the same?