Islet transplantation within mechanically stable microcapsules offers the promise of long‐term diabetes reversal without chronic immunosuppression. Reinforcing the ionically gelled network of alginate (ALG) hydrogels with covalently linked polyethylene glycol (PEG) may create hybrid structures with desirable mechanical properties. This report describes the fabrication of hybrid PEG‐ALG interpenetrating polymer networks and the investigation of microcapsule swelling, surface modulus, rheology, compression, and permeability. It is demonstrated that hybrid networks are more resistant to bulk swelling and compressive deformation and display improved shape recovery and long‐term resilience. Interestingly, it is shown that PEG‐ALG networks behave like ALG during microscale surface deformation and small amplitude shear while exhibiting similar permeability properties. The results from this report's in vitro characterization are interpreted according to viscoelastic polymer theory and provide new insight into hybrid hydrogel mechanical behavior. This new understanding of PEG‐ALG mechanical performance is then linked to previous work that demonstrated the success of hybrid polymer immunoisolation devices in vivo.

We investigated the use and validity of standardized achievement tests for summative evaluation of 78 educational intervention projects funded by the Institute of Education Sciences (IES) math and science education program. Investigators from 46 projects evaluated curricular interventions with standardized achievement tests as outcome measures. Twenty-five of the projects had potential validity problems related to a misalignment between the achievement test and the intervention. A closer analysis of 11 of those projects flagged as high risk for validity problems showed that only 6 projects attended to the validity of the test, and only 1 project provided adequate validity evidence. We conclude that there is widespread inappropriate use of achievement tests that threatens the validity of educational evaluations. To better support innovation, evaluators must dedicate more attention to the validity of the outcome measures they use.

Item response models (IRMs) were used to analyze Cross Racial Identity Scale (CRIS) scores. Rasch analysis scores were compared with classical test theory (CTT) scores. The partial credit model demonstrated a high goodness of fit and correlations between Rasch and CTT scores ranged from .91 to .99. CRIS scores are supported by both methods.

National and state assessments show that English language learners (ELs) in elementary and secondary grades score lower in mathematics compared with their matched English proficient peers (EPs). To provide information on strategies for enhancing learning opportunities for ELs in language inclusive classrooms, we analyze the efficacy of Learning Mathematics Through Representations (LMR), a curriculum unit on integers and fractions designed to support learning opportunities for ELs as well as EPs. LMR features the number line as a principal representational context and the use of embodied representations to support students as they explore mathematical ideas, construct arguments, and elaborate explanations. The study used a quasi-experimental design: Twenty-one elementary classrooms employing a highly regarded curriculum were included. Forty-four ELs were enrolled across 11 LMR classrooms, and 51 ELs were enrolled across 10 matched comparison classrooms. Multilevel analysis of longitudinal data on a specialized integers and fractions assessment, as well as a California state mathematics assessment, revealed that the ELs in LMR classrooms showed greater gains than comparison ELs and gained at similar rates to their EP peers in LMR classrooms. Further, contrasts between ELs in the LMR classrooms and EPs in the comparison classrooms revealed that LMR narrowed or eliminated the pretest achievement gap in mathematics. Both theory and empirical results support the value of LMR as a mathematics intervention benefitting both EL and EP students.

High-quality early learning has the potential to narrow disparities in children’s learning and development prior to kindergarten entry, particularly for children from families with low incomes and children who are multilingual learners. This study investigates the relationship between preschool quality and children’s learning and development from fall to spring of 1 school year through the analysis of child- and program-level data from approximately 70,000 children in California preschool programs. It suggests that attending a higher-quality-rated program is associated with greater learning and development than attending a lower-quality-rated program.