This 3-sentence summary provides the essential information from the document: Dave Mutart completed a 21-hour PolyWorks 2016 training from November 21 to November 23, 2016, as certified by this document. The training was provided by Nathan Doyle, a certified PolyWorks instructor, on those dates. This certificate confirms Dave Mutart's successful completion of the PolyWorks 2016 training course.