The deadline for applications, April 15th, is now only one month away. 2018 ACT-R Summer School and Master Class Carnegie Mellon University July 9-13, 2018 ACT-R is a unified theory of cognition that has been implemented in a software system called a cognitive architecture that can be used to develop computational cognitive models. It has been applied to modeling tasks that range from experimental tasks like simple reaction time and list learning, to real world tasks like driving a car and air traffic control. The 2018 ACT-R Summer School will take place at CMU in Pittsburgh from July 9-13. It consists of both a Summer School for beginning users and a Master Class for more experienced users. The Summer School will train researchers in the use of ACT-R for cognitive modeling using the ACT-R tutorial. Each day will consist of a morning theory lecture covering one or two tutorial units, an afternoon discussion session on the topics of the day, and modeling assignments which participants are expected to complete during the day and evening. The Master Class is organized in parallel with the Summer School. The Master Class offers the opportunity for ACT-R modelers to work on their own projects with guidance from experienced ACT-R researchers. There is no curriculum for the Master Class, but Master Class students are welcome to attend the Summer School lectures and discussion sessions. To provide an optimal learning environment, admission to the Summer School and Master Class will be limited. To apply for the Summer School, please email a curriculum vitae and a statement of purpose to db30@andrew.cmu.edu. Demonstrated experience with a modeling formalism similar to ACT-R will strengthen a Summer School application. To apply for the Master Class please email a curriculum vitae along with some information about your level of experience with ACT-R and some details on the project you expect to work on during the Master Class. Applications are due by April 15th and applicants will be notified of admission by April 30th. Admission to the Summer School and Master Class is free. Housing will be available in the CMU dormitories for approximately $65/day (single) or $50/day (shared). More information about ACT-R, including papers published by the ACT-R community, can be found on the ACT-R web site: <http://act-r.psy.cmu.edu/>. For more information on the Summer School and Master Class you can email Dan Bothell at db30@andrew.cmu.edu.