has part double blind study execution A double blind study execution is defined as any study execution in which neither the subjects nor the investigators are informed of which study arm the subjects are part of during the portion of the trial when the subjects are being treated Person:Alan Ruttenberg 2009/09/28 Alan Ruttenberg. Fucoidan-use-case double blind study execution http://clinicaltrials.gov/ct2/info/glossary#double informing investigator of subject study arm single blind study execution treatment portion of study execution informing subject of study arm metadata complete