This special issue presents the extended version of seven papers from the ACM Intelligent User Interface (IUI) 2019 international conference that was held in Los Angeles, California, from March 16 to 20, 2019. ACM IUI 2019 was the 24th IUI conference, continuing its tradition of being the main international forum for reporting outstanding research at the intersection of human-computer interaction and artificial intelligence. Along with a record number of delegates attending, the IUI 2019 conference received a record number of 282 full and short paper submissions from all over the world, of which 71 were accepted by the international program committee (acceptance rate of 25%).
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