In this design case, we describe our experience of designing and creating a teacher's dashboard as an accompanying tool to support sixth-grade teachers who implement a technology-supported problem-based learning program on sixth-grade space science in their classrooms. We describe in detail the background of this design case, our motivation to create this teacher's dashboard, and our iterative design process over a period of five years. Our design process consists of three phases from the idea generation phase to both low- and high- fidelity versions of the prototyping phase to three iterations of the implementation phase. We present our rationales for making various design decisions over the process and our reflections on this design experience including the challenges we have encountered.