“…As such, many educators and associations agree with these theorists and suggest that effective instruction in early education as well as in the elementary grades incorporates use of materials (Ball, 1992;Clements, 1994Clements, , 1999Clements, , 2002Fuson & Briars, 1990;Haugland, Bailey, & Ruiz 2002;Marsh & Cooke 1996; National Association of Education for Young Children-NAEYC, 1996, 2002Thompson, 1992;Uttal, Scudder, & Deloache, 1997;Varol & Farran, 2006). Specifically, it is acknowledged that materials may enhance interaction between teacher and students as well as interaction among students, facilitate students' understanding, enrich retention, and maintain motivation (Jaakkola & Nurmi, 2004;Mayer, 2003;Royer, 2002;Triona & Klahr, 2003). Besides overall benefits of instructional materials, teachers' selections and their rationale in regard to the most appropriate material for their instructional context have potential to increase the effectiveness of their instruction and maximize benefits of instructional materials.…”