With all of the research devoted to the use and effectiveness of constructivist learning principles in high school science classes, it is somewhat surprising to find that there is very little research devoted to constructivism's use in international settings. The problem that this lack of research poses is that classrooms are increasingly diverse as families are more and more frequently choosing to live in countries that they do not share a cultural background with. This means that there is an increasingly diverse range of cultural norms and expectations within a classroom, both of which are known to affect the effectiveness of learning strategies in general as the students will approach the problems in different ways. The purpose of this study, then, was to begin looking at whether teachers of international classrooms believe in the ideas of constructivism and whether those beliefs translate into classroom practice. A multiple case study approach was used to determine whether the beliefs of seven high school science classroom teachers and one high school administrator are consistent with constructivism and to what extent constructivist learning principles are being used to empower and engage students. The interview data suggested that most of the participants have some beliefs consistent with constructivism but do not fully embrace the learning theory. The observational evidence supported this by failing to provide evidence of constructivist activities in the classrooms. It was concluded that most of the participants in the study do not hold beliefs consistent with constructivism and that they are not using the learning theory to empower and engage students in the learning of science. Recommendations for future study include: exploring why teachers are not using constructivism to empower and engage students; provide training and support to help teachers successfully implement constructivism to engage and empower students; and expanding this study to determine whether the findings are consistent throughout the district. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]