denotes has specified input has characteristic has participant has role planned process participant under investigation role investigation agent role informing investigator of subject study arm Informing the investigator whether a patient is receiving a placebo or a treatment with an investigational compound. 09/28/2009 Alan Ruttenberg. This and the class informing-subject-of-study-arm are defined in order to solve the question of how to represent single and double blind experiments. To represent the aspect of double blinding pertaining to investigators, we say that the study execution doesn't include any processes of this sort Person:Alan Ruttenberg 2009/09/28 Alan Ruttenberg. Fucoidan-use-case A planned process with the objective to make the investigator aware of which study arm a patient is participating in. informing investigator of subject study arm metadata complete