DRM: a design research methodology proposed by Dr. Lucienne Blessing to help design researchers in fields related to engineering design identify research areas and projects and select suitable research methods to address the issues they find. An overview of this approach can be found at
http://ktem.prz.tu-berlin.de/FGKTEM/UserFiles/File/Forschung/Kompetenzthemen/engl/Flyer%20Blessing_en.pdf