This presentation elaborates on how different agents, human and nonhuman, enact participation in a practice-based research project about STEAM education in preschool. The project is carried out in two teams of four-six teachers and two researchers each. Researchers and teachers work in close collaboration with children (3-5-years old), spaces and materials in their preschools. Theoretically, the project employs a sociomaterial stance (eg. Barad, 2007), implying that the research process takes shape through collaboration between all the part-taking agents, both human and nonhuman. The presentation is built around a number of agential cuts (Barad, 2014) created at an early stage of a project. These cuts concern how different agents, such as teachers, researchers, children, materials and concepts, participate and how their participation affects the project. For example, we will elaborate on how the participation of a child, a lamp post, a researcher and physical phenomena (friction) affected the trajectory of the project. We will also discuss how different agents’ participation can increase or decrease the participation of other agents in the project.