Computer-based simulations can support a pedagogy consistent with constructivist learning theory and the concept of problem-based learning. When delivered in a collaborative environment in which learners are able to interact with one another together with practicing experts, students and instructors can form what Peter Senge refers to as a "practice field" or psuedo-community of practice. The Lincoln County Public Health simulation was designed to provide a platform upon which students can experience the challenge of assessing and intervening in a community-wide infectious disease outbreak. For more information about the Lincoln County simulation, read: Problem-based learning in public health instruction: a pilot study of an online simulation as a problem-based learning approach. Spinello E, Fischbach R. Department of Health Sciences, California State University, Northridge, CA 91331, USA. Presentation made at WASC Annual Conference: WASC 81st Annual Meeting: Building Cultures of Learning Beyond Rhetoric Problem-Based Learning in Public Health Instruction: A Study of an Online Simulation as a Learning-Centered Approach Presentation made at TechEd 2005 Conference in Pasadena, CA Creating an Online Community Health Simulation Using Inexpensive and Free Components