[header] How to criticize a colleague's work [title] Examine your motivation. [step] Only provide feedback if you are truly trying to help your coworker and improve your work product. If you are criticizing because you do not like the person, are frustrated, or are stressed, keep your criticisms to yourself. 
If you are not criticizing someone for the right reasons, try talking to a friend or family member so you can vent. [substeps] Feedback should only be given for a specific purpose not just for the sake of doing it.