The WIPO Digital Access Service for Priority Documents (“DAS”) was designed with a view to ensuring that a suitable, scalable and secure service could be delivered for applicants and Offices to facilitate transfer of priority documents electronically. It was agreed in the two previous sessions of the Working Group on the Digital Access Service for Priority Documents (“the Working Group”) that the initial launch of DAS would be limited to Patent priority documents. This document provides a functional overview of the current implementation and the technical architecture of DAS and suggests a number of business and technical developments for consideration by the Working Group, primarily in order to allow the system to be extended to delivering priority documents relating to other types of industrial property right: trademarks, industrial designs and utility models.