Feedback is crucial to continuous growth and improvement, but it is deceptively hard to both give and receive, especially in data viz. The success of feedback depends both on the method of the feedback and the recipient. We'll go over lessons learned from the Feedback Loop, VizOfficeHours, the IronViz feedback initiative, and MakeoverMonday on how to give constructive, helpful feedback that can help a person grow. We will also touch on how to avoid harmful feedback that can both hinder the recipient's progress and create a space where people become afraid to ask for feedback. Lastly we will talk about how to be a good recipient of feedback and some thoughts on what you should with feedback and how to handle feedback that is either unsolicited or does not work for your vision.