Examines reasons for cataloging backlogs in libraries and describes a preliminary theory of backlog dynamics. Formulas for predicting backlogs are discussed, backlog models are explained, the use of computer simulation software to form models is described, and further research is suggested. (five references) (LRW)

This policy brief describes the components of a computer model to compare different financing approaches for universal early care and education programs as developed by the Financing Universal Early Care and Education (ECE) for America's Children Project. The brief also discusses lessons learned from analyzing key features of existing…

Reviews research and development in media and computer based classroom simulations, emphasizing feasibility and reliability, presentation modes, and benefits. Areas of further study are highlighted, including transfer of training, degree of realism necessary, and correlation with instructional theories; specific variables for study are also…