This is developmental research with the purpose of elucidating the methodology used to design a financial education training module for secondary school mathematics teachers. Currently, the Ministry of Education Malaysia and Bank Negara Malaysia have entered into a partnership to integrate financial education into the school curriculum. However, there is a lack of specialised modules on teaching financial education for secondary school mathematics teachers. Appointed mathematics teachers need to have specific training modules to enable them to perform quality teaching strategies. Thus, this study proposes a design research approach, Design and Development (DDR), that is, a research approach to multi-method development. Using DDR, this study will go through three phases of study and use several different study tools in each phase. The involvement of study participants from expert groups and user groups can provide a variety of inputs and take into account the needs of the module. Therefore, the findings provided useful evidence of potential in designing and developing a financial education training module for secondary school mathematics teachers.