Importing a single ISM surface member as a set of RAM Concept slab areas and openings is straightforward. The surface members and surface member modifiers are imported as RAM Concept slab areas. The openings are imported as RAM Concept openings. The slab area created from the surface member is assigned a priority of 0. The openings are assigned a priority of 90. The slab areas created from the surface member modifiers are assigned priorities in the range 10-89, with an increment of at least 2. Modifier priorities are compressed where possible (e.g., where two non-overlapping modifiers may be set to the same priority). A surface member that overflows this range (i.e., it contains modifiers in a configuration that requires more than 45 distinct modifier priorities) should be very rare. In this case, some of the modifiers will have duplicate priorities. You will need to fix this model in the RAM Concept modeler and then update the ISM repository.

The priority mapping is applied to each surface member on the story. If the boundaries of surface members overlap, it should only be in the opening of one surface member. The priorities of the slab areas and openings of the overlapping surface member are offset by a multiple of 100 to make the RAM Concept model unambiguous.