How hard is it to build? How is the modelling managed?
It is hard. GRAIL is a relatively new language, and, although it is similar to other concept representation languages, none had previously been used to build a model of the anticipated scope and detail that is present in the GALEN Common Reference Model. New techniques and tools for building the GALEN Common Reference Model have had to be developed. There are three parts to its development. The first is a small group of GRAIL modelling experts working very closely together, developing the high-level ontology, and defining structures and styles for the model. They work directly in GRAIL, in which it takes on the order of 3 months to become proficient. GRAIL is now treated as the assembly language , and it is not expected that large numbers of clinicians will need to become proficient in its use. The second part is a loosely-coupled collection of clinicians working and contributing separately in the model.
