Conversational interfaces and especially voice interfaces are the most personal channels for a digital product. For which kind of products are they applicable and what are necessary prerequisites? Once you identified what you want to build the question arises how to build it? What are recommended voice interactions and best practices? What design elements are available? Do we already see common interaction patterns emerge? Finally the interface has to be build in a professional way. In addition to the actual coding we will look at local development, deployments and stages, multi-language support and testing.