Real-world contexts help students engage with learning activities. The Framework for K-12 Science Education and the Next Generation Science Standards emphasize integrating STEM content and real-world contexts into K-12 learning experiences, highlighting the need for high-quality curriculum. In engineering design-based STEM integration curricula, the potential for client letters to help foster student learning and engagement has been understudied. We conducted a qualitative document analysis of fifty-eight embedded client letters in fifteen engineering design-based K-12 STEM integration curricular units. Through the lens of the STEM Integration Framework, we explored the following research questions: (1) What is the role of client letters in context-rich, engineering design-based K-12 STEM integration curriculum? (2) How do client letters add value to engineering design-based STEM integration curriculum? The analysis revealed unique roles of different client letters and the important contextual elements to convey in each role, deepening the connection between content and real-world scenarios in support of problem scoping, knowledge building, engineering design, and concluding response. Additionally, we found that client letters add value to the curriculum by strengthening motivating and engaging context anchored in authentic experiences, connecting content and the engineering design challenge to real-world scenarios, supporting student-centered instructional strategies, and enhancing other ties to STEM integration. This study provides evidence that client letters embedded in K-12 STEM integration curricula support essential elements of high-quality curriculum, which have the potential to foster student learning through deepening student engagement, applying crosscutting concepts from multiple STEM disciplines, and supporting high quality pedagogies. Teachers should consider the use of client letters to support their use of student-centered pedagogies, while curriculum developers should embed client letters to integrate context and real-world content into STEM learning resources. Additionally, professional development trainers could help teachers effectively implement client letters to maximize their impact, potentially fostering deeper student engagement with both the context and content of STEM integrated learning.
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