This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.In this study, drawing on effectuation theory, we combine analytical strategies for process data to examine inductively and theorize how founder teams' perceptions of uncertainty and behavioral logics develop during new venture creation processes. The results reveal four phases and suggest a possible evolution from a causal conditional relationship between perceived uncertainty and behavioral logics to an integrative relationship. We bring to light the notion of temporality and unanticipated consequences, discuss their central roles in perceived uncertainty, effectuation, and causation, and offer revelatory insights into why and w...