But experts do differ in how they organize and use this content knowledge. Experts possess knowledge that is more integrated, in that they combine new subject matter content knowledge with prior knowledge; can relate current lesson content to other
subjects in the curriculum; and make lessons uniquely their own by changing, combining, and adding to them according to their students’ needs and their own goals.

John Hattie - http://www.acer.edu.au/documents/RC2003_Hattie_TeachersMakeADifference.pdf

Something to consider in light of the current review of digital content being conducted by WAG