The project described in this article took place in fall 2019 and lasted for seven months in a preschool classroom consisting of a master teacher, teacher and assistants, and 21 children (ages 3-5) within a university-based early childhood education center that serves children from birth through six years old. The teachers began the inquiry, embarking on a speed project in the classroom and using a planning tool developed based on years of project work experience with young children (Arias and Abramson 2018), the study of research on early childhood education science curricula, and on Reggio-inspired philosophy. This planning tool is called the Science, Technology, Engineering, Arts, and Mathematics (STEAM) Planning Guide. Using this guide, teachers can conceptualize and plan science and engineering explorations and investigations from simple to more complex. These scaffolded activities will provide children opportunities to apply the crosscutting concepts and deepen their understanding of core ideas across disciplines.