This paper explores a research approach for creating a digital transformation maturity (DTM) assessment tool specific to development NGOs. This paper focuses on the initial phase of the co-creation approach for such a tool with practitioners of these organisations. The process ensures relevance and adjustment to appropriate and understandable language for development practitioners. Rigour is ensured later through a detailed literature review on the concept of digital transformation of development NGOs as a specific group of non-profit organisations. We present the findings of the first phase of the research with the evaluation of five digital maturity assessment tools for non-profit organisations. This paper contributes to setting out design criteria for a quick & shorter digital transformation maturity assessment more focused on the context of development NGOs. This quick scan will help development NGOs decide on the next steps, like the choice for more detailed measurements. Secondly, we identify a possible shortcoming of current DTM tools that are not linked to the development paradigm and strategy of the NGOs. We conclude the evaluation by reflecting on limitations and the need to adjust DTM assessment tools to organisational development paradigms and goals of NGOs, suggesting the need for future research.