Think before you speak! Be humble and don't take it personally. Depending on who the criticism is coming from, you will want to approach it differently. If it's coming from your boss, you will want to respond respectfully, saying something like, "I appreciate the feedback. Now I know how I can improve next time." If it's coming from a client, you may want to tell them, "I am so glad you noticed! I'll make the changes right away." You may have a similar response for anyone's critical comments, but the key is to stay calm and never express frustration towards the person. Give an example where you stayed professional when someone gave you negative feedback. If there was something you needed to change or repair, you responded promptly: "I completely understand where you're coming from. I'll care of it right away!"