ABSTRACT Background K12 teachers need a wider range of design approaches to foster feasible qualitative improvements in all students’ schooling experiences. We propose a framework for conceptualizing pre-service teachers’ stances toward designerly thinking. Methods We developed the framework following Crismond and Adams’ scholarship of integration approach combined with an inductive content analysis of 43 pre-service teachers’ conceptualizations of design across two versions of a design course. Results The resulting framework focuses on six dimensions including: (a) co-evolution of problem frames and possible solutions, (b) problem complexity and structure, (c) idea fluency and scope, (d) inquiry and stakeholder engagement, (e) conceptualization of the design process, and (f) attitude toward ambiguity. Each dimension articulates anchor points and examples based on the literature and grounded content analysis of the data. The analysis and discussion consider the conceptual accessibility of the framework’s goals for pre-service teachers and whether they considered the goals feasible to implement in the context of curricular mandates. Contribution The proposed framework provides the foundation for a hypothetical learning trajectory that can be elaborated and validated through future research to support K12 teachers in their development as informed designers who might better serve the needs of all their students.