An Investigation of Teacher Understanding and Perceptions of the Effectiveness of the Use of Learning Targets in the Classroom

Conflicting opinions and stances concerning standardization of curriculum in the United States education system are evidenced throughout the nation in the format of debates about the purpose of education and the curriculum. In 1892, nationally recognized American educators met as a Committee of Ten (National Education Association [NEA], 1893) to determine what subject matter should be contained in a formalized system of education, thus establishing the roots of the modern American school system. The results from the meeting were not accepted by all educational entities within the United States and curriculum content continued to be a matter of social and political debate resulting in legislative mandates designed to transform educational policy and practice. Leaders on the local, state, and national levels continue to pass new laws establishing and regulating educational standards and measurements for accountability, while classroom teachers are directed to adhere to many new directives and to become adept at a myriad of strategies and requirements to avoid being judged as inept and ultimately removed from the classroom. This action research study investigated the effectiveness of the use of Learning Targets throughout classroom curriculum by teachers as they promote instructional alignment to ensure student learning. This study explored how teachers develop, deliver, and assess student learning based on the processes and strategies contained within the Learning Target Theory of Action. It determined the perceptions about the processes involved and effectiveness of the Learning Target theory in the classroom. Finally, it placed emphases on ascertaining how students perceive the effectiveness of Learning Targets to their success in learning

The contribution of lower-mineralized tissue to the healing of distal radius fractures assessed using HR-pQCT

High-resolution peripheral quantitative CT (HR-pQCT) enables quantitative assessment of distal radius fracture healing. In previous studies, lower-mineralized tissue formation was observed on HR-pQCT scans, starting early during healing, but the contribution of this tissue to the stiffness of distal radius fractures is unknown. Therefore, the aim of this study was to investigate the contribution of lower-mineralized tissue to the stiffness of fractured distal radii during the first twelve weeks of healing. We did so by combining the results from two series of micro-finite element (µFE-) models obtained using different density thresholds for bone segmentation. Forty-five postmenopausal women with a conservatively-treated distal radius fracture had HR-pQCT scans of their fractured radius at baseline (BL; 1-2 weeks post-fracture), 3-4 weeks, 6-8 weeks, and 12 weeks post-fracture. Compression stiffness (S) was computed using two series of µFE-models from the scans: one series (M ) included only higher-mineralized tissue (>320 mg HA/cm ), and one series (M ) differentiated between lower-mineralized tissue (200-320 mg HA/cm ) and higher-mineralized tissue. µFE-elements were assigned a Young's Modulus of 10 GPa (higher-mineralized tissue) or 5 GPa (lower-mineralized tissue), and an axial compression test to 1 % strain was simulated. The contribution of the lower-mineralized tissue to S was quantified as the ratio S /S . Changes during healing were quantified using linear mixed effects models and expressed as estimated marginal means (EMMs) with 95 %-confidence intervals (95 %-CI). Median time to cast removal was 5.0 (IQR: 1.1) weeks. S and S gradually increased during healing to a significantly higher value than BL at 12 weeks post-fracture (both p < 0.0001). In contrast, S /S was significantly higher than BL at 3-4 weeks post-fracture (p = 0.0010), remained significantly higher at 6-8 weeks post-fracture (p < 0.0001), and then decreased to BL-values at the 12-week visit. EMMs ranged between 1.05 (95 %-CI: 1.04-1.06) and 1.08 (95 %-CI: 1.07-1.10). To conclude, combining stiffness results from two series of µFE-models obtained using single- and dual-threshold segmentation enables quantification of the contribution of lower-mineralized tissue to the stiffness of distal radius fractures during healing. This contribution is minor but changes significantly around the time of cast removal. Its course and timing during healing may be clinically relevant. Quantification of the contribution of lower-mineralized tissue to stiffness gives a more complete impression of strength recovery post-fracture than the evaluation of stiffness using a single series of µFE-models