Conceptions of effective teaching that are limited to instructional
practices are incomplete because in addition to these
practices a specialized knowledge for teaching, called pedagogical
content knowledge (PCK), is also needed (Shulman, 1986). A
teacher’s PCK, therefore, is an important outcome in describing the
quality of teaching because it impacts every part of a teacher’s
professional practice from planning, implementation, assessment,
reflection and revising for the future (Park et al., 2011; Shulman,
1987).