Being an analyst with modern visualization technology is fun and enriching. Who doesn’t enjoy a stunning visual with useful and easily consumable insights? The reality is: even the most thoughtful authors have blind spots. Why? Because authors have significant amount of background knowledge that is not carried through via visualizations. In the absence of that, users relay on visual cues and the knowledge they learn from elsewhere to interpret what they see. This often cause communication gaps in data visualization, particularly in situations where report is authored by one person and used by many users from different teams, different backgrounds, and have different background knowledge and chart reading abilities.