Policy World
Policy World is a game to teach students how to reason about public policy. It embeds an intelligent cognitive tutor in an game-like inquiry environment to make teaching policy deliberation both effective and fun. This game builds on a cognitive model of deliberation and several empirical studies on how students use evidence and causal diagrams.

Lesson Study
Lesson study is a continuous improvement process in which teachers research, redesign, test, and share a single lesson. I've conducted preliminary work analyzing video data on how teachers use student interviews to learn about student thinking, and also prototyped a web-based system for sharing lesson-plans.

iLogos
iLogos is a simple argument mapping tool that you can use for teaching or research. iLogos is currently being used by Carnegie Mellon's introductory philosophy classes.

The Causality Lab
The causality lab is an online inquiry environment for teaching scientific reasoning in which students make hypotheses, collect data, create graphs of the data, examine statistical realtionships and build causal models of the data. I was the lead software engineer on this project from 2002-2006.