e-Portfolio use in the UK (and wider) has escalated over the past decade driven mainly by Personal Development Planning, Life-Long and Life-Wide Learning agendas. During this period e-portfolio tools and technologies are continuing to mature. There are a variety of instances of large-scale institutional implementation and unshared institutional knowledge about implementation issues. ePI seeks to work with key stakeholders to identify, document, analyse and understand the processes involved in large scale e-portfolio implementations within HE/FE and professional organisations. It will use and further develop a threshold concept framework that resulted from recent JISC work in this area. ePI will disseminate this practice through the use of a range of case studies to support large-scale institutional e-portfolio use.