This session shows how to develop applications for multiple screen sizes, screen resolutions and form factors like phones, tablets and desktop PCs with Qt. We show how you can use the same code base, while having native-looking UIs & UX across platforms. This involves tips for responsive design with Qt, how to best use the new Qt Quick Controls, and a comparison when to use Qt Quick and in which cases C++ is the better choice. We also explain how you can simulate multiple screen resolutions and platforms including iOS & Android and their native UI from a single Desktop application. In the second part of this session, we will highlight how you can leverage the full app lifecycle with Qt: from design to development, testing, deployment to publishing. And how you can efficiently perform post-publishing tasks like analytics & ongoing app improvements in the Qt ecosytem. This presentation gives you a non-technical overview of the possibilities with Qt for multi-screen and multi-platform development and shows best practices for an efficient app lifecycle with Qt. For an in-depth session with code examples see the technical second part of this presentation in the Qt Application Development & Device Creation Track.