Lawrence Escalada is an associate professor in physics and science education at the University of Northern Iowa. He teaches introductory physics/physical science and secondary science methods courses, and works with high school physics teachers and students on a number of different projects and activities. He has taught high school physics and physical science and has been involved in developing instructional materials including the Visual Quantum Mechanics— The Original and Physics Resources and Instructional Strategies for Motivating Students (PRISMS) PLUS.Department of Physics, 205 Physics Building, University of Northern Iowa, Cedar Falls, IA 50614-0150; escalada@uni.edu

Sanjay Rebello is an assistant professor in physics education at Kansas State University. He has been involved in physics education research for the past seven years. His interests include research on students' mental models of real-world applications, curriculum development in contemporary physics, and use of technology in the teaching and learning of physics.Department of Physics, Kansas State University, Manhattan, KS 66506-2601; srebello@phys.ksu.edu

Dean Zollman is head of the Department of Physics and University Distinguished Professor at Kansas State University. He has been conducting research on student learning of physics and developing instructional materials for more than 30 years. AAPT awarded him its 1995 Robert A. Millikan Medal. In 1996 he was named the Doctoral University National Professor of the Year by the Carnegie Foundation for the Advancement of Teaching.Kansas State University, Manhattan, KS 66506-2601; dzollman@phys.ksu.edu