To support preschool children’s learning about data in an applied way that allows children to leverage their existing mathematical knowledge (i.e. counting, sorting, classifying, comparing) and apply it to answering authentic, developmentally appropriate research questions with data. To accomplish this ultimate goal, a design-based research approach was used to develop and test a classroom-based preschool intervention that includes hands-on, play-based investigations with a digital app that supports and scaffolds the investigation process for teachers and children. This formative study was part of a codesign process with teachers to elicit feedback on the extent to which the series of investigations focused on data collection and analysis (DCA) and the teacher-facing app were (a) developmentally appropriate, (b) aligned with current preschool curricula and routines, (c) feasible to implement, and (d) included design elements and technology affordances teachers felt were useful and anticipated to promote learning.