The Quayside planning process has attracted a lot of interest from the public and the media, both in Toronto and internationally. One of the top concerns for citizens, the civic tech community, and privacy experts is how personal data and public data will be collected, shared, controlled, and used in Quayside. These concerns are not unique to Quayside. We expect every city in Canada will need to address these questions within the next five years. Because Quayside presents a specific plan for a particular place, it provides the opportunity to have a more detailed, grounded, and concrete discussion about responsible data sharing. The use cases we develop in this primer are applications that are plausible for Quayside, but were selected to have relevance to cities beyond Quayside.