SDTM is the most stable and better understood of the CDISC Clinical Data Standards. SDTM is very prescriptive and, although there is ‘wiggle room,’ there is not as much as if you design your database from scratch. Understanding this, and developing a solution that works as a data collection and cleaning tool, can present quite a challenge. Yvonne Moores at Quanticate guides us into the interconnection of clinical programming and clinical data management.