High quality materials related to statistics content and pedagogy are needed for secondary mathematics teacher education. This paper will describe the design principles utilized by a multiinstitutional team to develop online modules for preservice teachers focused on statistical thinking and tools for teaching statistical inquiry. Design principles that guided creation and development will be shared, including: 1) use of free and accessible tools, 2) connection to classroom practice, and 3) access and delivery online. The project’s role in further developments to CODAP, a free Common Online Data Analysis Platform, will be highlighted. Results of a pilot test implementing the first module will be shared.