This document discusses open data initiatives and provides guidance on starting an open data program. It defines open data as government data that is freely available in a machine-readable format for public use and reuse. Making data open means it is technically accessible in standard formats and legally open with an open license allowing commercial and non-commercial use. Open data programs aim for transparency, citizen engagement and business support. The document lists examples of open data from different cities and recommends choosing a initial data set, applying an open license, formatting it for audiences, and creating a central portal for discovery. It also discusses using hackathons to support open data and the need for open data policies, resources, and sustainability plans.