This sought to determine the effect of project based learning (PBL) professional development and implementation on teachers’ perceived ability to teach and assess
21st century skills. At the end of the 2010--‐2011 school year data on teaching practices and perceptions were systematically gathered and compared from two groups of teachers matched by demographics, grade and subject: teachers expected to have utilized PBL after
Extended professional development (44) and teachers who had not received the professional development or were not expected to have used PBL (42). Teachers who used PBL and received extensive professional development reported more teaching and assessment of 21st century skills overall, with similar patterns seen within subjects and for nearly all of the measured skills.