This document discusses how open data can lead to more efficient government services in Zurich, Switzerland. It provides examples of apps created using open data that deliver services faster and at lower cost than traditional government approaches. Specifically, it highlights a popular swimming pool app that required no additional funding and little coordination from the city. However, it also notes challenges in getting some data owners to publish data due to concerns about effort, control and commercialization. Overall, the document argues that open data can boost government efficiency by enabling third parties to create new digital services, though success depends on establishing clear rules for mandatory data publication.