When you create a Screenful dashboard, you get a nice set of charts pre-selected on your dashboard for Trello, JIRA, GitHub, or Pivotal Tracker. You can configure charts according to your preferences and you can further tweak your charts using filters. The pre-selected charts provide you a fairly complete picture of the status of a project, big or small, agile or not.
But you don't have to stop there. You might need a specific piece of information, which is not captured by the any of the default charts. Then it's time to dig deeper into your data by creating a custom chart.