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At the same time, playtests of games without voice acting may give different results than testing where it is present. This creates a situation where improvements identified from play testing are either ignored or leads to extensive re-recording of voice acting. This article presents a design science research project where text-to-speech (TTS) synthesis is used as a substitute for recorded voice acting in the early stages of game production. We propose a set of design principles that have been evaluated in a sharp game production. Our results indicate several benefits of using TTS as a prototyping tool: It can be a source of inspiration for game writers, it gives good estimations on timing and pacing of the game, and it allows for early tests of how the dialog will be perceived by players. The quality and characteristics of the voices provided by the TTS system play an important role in this process. The rapid development in the speech technology field opens many future possibilities.<\/jats:p>","DOI":"10.1145\/3276321","type":"journal-article","created":{"date-parts":[[2018,11,13]],"date-time":"2018-11-13T13:20:16Z","timestamp":1542115216000},"page":"1-16","update-policy":"http:\/\/dx.doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Using Text-to-Speech to Prototype Game Dialog"],"prefix":"10.1145","volume":"16","author":[{"given":"Henrik","family":"Engstr\u00f6m","sequence":"first","affiliation":[{"name":"School of Informatics, University of Sk\u00f6vde"}]},{"given":"Per Anders","family":"\u00d6stblad","sequence":"additional","affiliation":[{"name":"School of Informatics, University of Sk\u00f6vde"}]}],"member":"320","published-online":{"date-parts":[[2018,11,12]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Acapela Group. 2017. Brainy voices: Innovative voice creation based on deep learning by acapela group research lab. 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