As part of an outreach initiative by the Natural History Museum in Vienna, Austria, an interdisciplinary educational module was developed to teach students about sustainability through the lens of mineral resources used to produce mobile phones. The overall goal of the module is to provide teachers of different subjects with a multifaceted tool to…

Given that there is no universal way to measure implementation fidelity, instructional designers developing instructional innovations may find themselves faced with the challenge of determining the extent to which teachers' implementation of an instructional model is faithful. This article contends that a faithful implementation is one in…

The purposes of this study were to (1) investigate non-accelerated middle schools students' understanding of pre-algebraic concepts, in particular, addition and subtraction of integers and the notion of equality; (2) describe and analyze how non-accelerated middle school students interact with The Geometer's Sketchpad (GSP) applets depicting…