This document discusses data dashboards and common mistakes in their design. It defines a dashboard as a visual display of important information to achieve objectives that is monitored at a glance. The document outlines 13 common mistakes in dashboard design, such as exceeding a single screen or supplying inadequate context. It also provides examples of software that can be used to build dashboards, such as Excel, Tableau, and R. Attendees participated in an activity to design a sample dashboard for their work and discussed how dashboards can help inform decision making.