This thesis reports on how primary and secondary teachers' knowledge influenced the implementation of a Year 1-10 science syllabus which was introduced into Queensland in 1999. The study investigated how the teachers' knowledge of the primary and secondary teachers differed and how teachers' knowledge impacted on the implementation of the science curriculum. Teacher knowledge otherwise referred to as teacher beliefs and practices has been acknowledged as an influence in the implementation of curriculum. Yet, a considerable portion of curriculum evaluation has focused on measuring the successful implementation of the intended curriculum and not the enactment. As a result, few studies have investigated how the curriculum has been influenced by teacher knowledge or have compared primary and secondary teacher knowledge. Furthermore, in order to provide a seamless grade one to ten science syllabus it is necessary to compare primary and secondary teacher beliefs and practices to determine whether or not the beliefs and practices held by these two groups of teachers is similar or dissimilar and how these beliefs and practices in turn, impact on the implementation of a curriculum. The research adopted Eisner's (1991) methodology of educational criticism and used a comparative case study approach to investigate the teacher knowledge of four primary and three secondary teachers. Data were presented as a dialogue between three composite characters, a lower primary, a middle/upper primary and a secondary teacher. The results revealed that teachers utilised three sets of beliefs to shape the implementation of the science curriculum. These were categorised as expressed, entrenched and manifested beliefs. The primary and secondary teachers did possess similar sets of beliefs and knowledge bases but their strategies for implementation in some instances were different. Furthermore, these sets of beliefs and knowledge bases served as motivator or an inhibitor to teach science in the manner that they did. A theoretical model was developed to explain how these sets of beliefs influenced the curriculum. This study provides professional developers with a framework to observe teacher beliefs in action and thereby to assist in the facilitation of curriculum change.

This study examined exceptional student educators’ (ESE) personal practical theories (PPTs) and how they impact complex decision-making when it comes to students with disabilities and their families. A case study methodology was selected to explore how four ESE teachers and leaders developed their PPTs as well as how they planned, interacted, and reflected upon decisions made during one workweek. The guiding questions of this study were: what are the PPTs of ESE leaders and teachers, what factors influence the development of PPTs, and how do PPTs impact special educators’ work with students with disabilities? To address these questions, four participants were selected based on their role within the district, their experiences working with students with disabilities, and their reputation for being high quality educators. Data were collected using a PPT workbook as well as in-depth, semi-structured interviews. The results of this study included five PPTs for each participant and eight common themes. These themes included: care for students and families, safety of students, administration and teacher professional development, ensuring high expectations for students, personal and professional advocacy, mentoring and collaboration, reflection and problem solving, and problems with inclusion. These results are presented in this dissertation in support of an argument for the need for increased pre-service and in-service for ESE educators, increased professional development for administrators, and increased training for inclusion teachers working with students with disabilities. Engaging in a practice of exploring and refining teacher and leader beliefs and assumptions using the PPT process may increase the reflective practice of teachers and perhaps result in a more appropriate form of evaluation for educators.