The cost-effectiveness of an English language curriculum for middle school English learners.

Best practice suggests that curricular decisions be made on the evidence base of the content and the contextual fit of the curriculum to the school setting, and with coaching to help teachers effectively use curricula. Messages from the federal government encourage school administrators and researchers to consider the costs of a program. The Middle School English Learner Project, an evaluation of the curriculum, provides the opportunity to document and analyze the cost-effectiveness (CE) of a high-quality implementation of one English language program.

Measuring Explicit Instruction Using Classroom Observations of Student-Teacher Interactions (COSTI).

This article describes the development and technical adequacy of the Classroom Observations of Student Teacher Interactions (COSTI) instrument, a tool for measuring the frequency and rate of explicit instructional interactions, such as those used in Direct Instruction curricula, for teaching children basic reading and math skills. COSTI was originally developed to provide teachers with coaching feedback to improve their explicit reading instructional practices and has been shown in multiple studies to be a reliable and valid predictor of student gains in beginning reading and math skills. This article discusses potential uses of the instrument for training and coaching across curricula with varying instructional design features, and lays out a future research agenda to further improve COSTI and related observation tools for studying explicit instructional practices and their contribution to student learning.

Diet discrimination factors are inversely related to δ15 N and δ13C values of food for fish under controlled conditions.

A recent literature review reported negative relationships between diet discrimination factors (DDFs = X(fish) - X(food) ; X = δ(15) N or δ(13) C) and the values of δ(15) N and δ(13) C in the food of wild organisms but there has been no laboratory-based confirmation of these relationships to date. Laboratory reared guppies (Poecilia reticulata) fed a series of diets with a range of δ(13) C (-22.9 to -6.