This is a fair, if terse, summary.  However it should be more explicit with the practice accepted as potentially the most evil use of pie charts: any comparison between two, or more, pie charts where the whole has also changed in some fashion.  This is most commonly seen as some breakdown of budgetary expenses compared between two years where the total budget has also changed.  Attempting to depict this additional change by making one pie larger doesn&#x27;t work as the eye is too easily fooled between angles and areas.  So unless you can somehow assure the audience that the two pies have the exact same base don&#x27;t compare pie charts.