This document discusses opening up public data to improve transparency and efficiency. It defines public data and outlines principles for publishing public data, such as making it reusable, machine-readable, and available through a single access point. It also provides examples of data that local councils could publish, such as information on communities, businesses, locations, and council services, finances, and performance. Finally, it discusses standards and architectures for aggregating and sharing public data across different areas in a consistent and reusable way.