In-Service Science Teachers' Pedagogical Content Knowledge‪.‬

INTRODUCTION The age of global change need more effective instruction, not only student make themselves to supported this age, but also teachers should be reacted their knowledge in the complexity. Key aspects of the complexity are widely used term pedagogical content knowledge, which incorporates the blending of content and pedagogy into an understanding of how particular topics, problems, or issues are organized, represented, and adapted to the diverse interests and abilities of learners and presented for instruction (Shulman, 1987). Teacher should have declarative knowledge of the content and pedagogy for authority and supports the idea that teaching is a profession (Ball et. al, 2008, p. 404).