This poster presents a research design on how mathematics teachers can be involved in creating a shared understanding of their declared intentions and practices with digital tools in their mathematics teaching. The context of this poster is an ongoing PhD project with two strands. On one hand it aims to investigate and map the reasoning for mathematics teachers{\textquoteright} use or non-use of digital tools (CAS, Spreadsheets, Dynamic geometry) in their practice. On the other hand, it aims to explore a method of high practitioner participation with data and digital methods. The project{\textquoteright}s research question is: How can the utilization of the workshop format inspired by participatory data design involve mathematics teachers in creating a shared understanding of their declared intentions and practices with digital tools in their mathematics teaching?