The aim of this project was to examine the costs and benefits of three alternative models for scholarly publishing (i.e. subscription publishing, open access publishing and selfarchiving). In so doing, it seeks to inform policy discussion and help stakeholders understand the institutional, budgetary and wider economic implications. The project involved two major phases: • Phase I: Identification of costs and benefits – sought to describe the three models of scholarly publishing, identify all the dimensions of cost and benefit for each of the models, and examine which of the main players in the scholarly communication system would be affected and how they would be affected; and • Phase II: Quantification of costs and benefits – sought, where possible, to quantify the costs and benefits identified; identify and where possible quantify the cost and benefit implications for each of the main players in the scholarly communication system; and, where possible, compare the costs and benefits of the three models. Additional authors: Bruce Rasmussen, Peter sheehan, Charles Oppenheim, Anne Morris, Claire Creaser, Helen Greenwood, Mark Summers and Adrian Gourlay.