This document contains three papers on simulation from the SITE (Society for Information Technology & Teacher Education) 2001 conference. "Simulations in the Learning Cycle: A Case Study Involving 'Exploring the Nardoo'" (William M. Dwyer and Valesca E. Lopez) presents a study of middle school students using a CD-based simulation program, "Exploring the Nardoo," in all phases of the learning cycle. "A Pilot Study of the Web-Based Environmental Simulation" (Tago Sarapuu and Margus Pedaste) presents a three-week pilot study in which nine groups of students from three different schools passed five virtual communities of the World Wide Web-based simulation "Hiking across Estonia.""The LPII Simulation: A Lesson-Planning Tool for Preservice Teachers" (Harold R. Strang and Ronald J. Clark) describes the key features of the LPII, a Visual Basic simulation designed to help preservice teachers gain insights in planning effective lessons for both motivated and unmotivated students. All of the papers contain references. (MES)