IDOV is one popular methodology for designing products and services (DFSS) to meet Six Sigma Standards.
The basic Six Sigma toolkit does not provide the rigor needed to invent a new product or service (or completely overhaul an existing process) - DMEDI does.
Making a single DMAIC-DFSS roadmap elicits numerous coexistence and integration questions. Nonetheless, a combined core roadmap is possible.
DMAIC and DMADV are two Six Sigma methodologies that eliminate defects from a process or product; learn about them and when it is most appropriate to use each.