“…The Target Inquiry (TI) model for high school teacher chemistry professional development was designed with the aforementioned proven PD practices in mind, and translated into a coherent 2 ½ year program based on these basic tenets from the PD literature: (1) inquiry instructional strategies require a well-developed knowledge of content and pedagogy (NRC, 1996;Gess-Newsome, 1999); (2) changes in teachers' content knowledge, beliefs and attitudes, and pedagogical knowledge are required for instructional change (Loucks-Horsley and Stiegelbauer, 1991;Shumba and Glass, 1994;Borko and Putnam, 1995;Anderson, 1996;Phelps and Lee, 2003); (3) effective PD addresses barriers to inquiry instruction, including lack of access to inquiry materials and assessments (Caton et al, 2000;Straits and Wilke, 2002;Anderson, 2007), curriculum constraints (Flick et al, 1997;Keys and Bryan, 2001;Tretter, 2003), and inadequate in-service education (Anderson, 1996); and (4) central characteristics of highquality PD, such as duration, collective participation, active learning, coherence, and content-focus (Garet, et al, 2001) and critical features of transformative PD (Thompson and Zeuli, 1999) must be integrated into the PD.…”