Book excerpt: Describes the newest method for predicting outcomes that result from the complex and dynamic ways that organizations work. By creating "virtual organizations," computational modeling demonstrates the final effects of complex interactions, enabling researcher to confront the logic of their theories before time-consuming and costly data collection occurs. Through modeling, vital questions about personality, industrial/organizational psychology, measurement, and assessment issues in both theoretical and applied research are addressed. This volume shows researchers both the advantages of using computational modeling and the best strategies, contexts, and methods for use.