“Critical Materiality: Creating Toolkits and Methods for Engaging Materiality in HCI,” organized by Joanna Berzowska, Aisling Kelliher, Daniela Rosner, Matt Ratto, and Suzanne N. Kite. The Studio will take place at TEI 2019, Sunday 17 March 2019, in Tempe, Arizona, USA. Studios at TEI encourage new and enriching perspectives in the fields of tangible, embedded, and embodied interaction by combining the practical and hands-on with academic debate/discussion around the chosen topic. The goal of this one-day studio is to develop tools to acquire a deeper conceptual and critical understanding of materiality in HCI. The studio will draw on strategies from a broad range of sources including critical making, speculative design, experiential prototyping, and indigenous ontologies, in order to map out key questions and concerns.