The ISM link has known limitations. Some of these stem from the differences between analytical and physical models. Others are due to the differences in capabilities of RAM Structural System, ISM, and other programs. The following highlights these:

• Parametric and table sections are supported for steel elements. Not all built-ups are interchangeable.
• Only rectangular and T sections are supported for concrete beams.
• Only rectangular and circular sections are supported for concrete columns.
• Kinked or curved members are imported from their end points as a linear member.
• Some configurations of cantilevers may be unresolveable and will require modification in Modeler.
• Composite beams stud values are exported only.
• Camber values are exported only.
• The link does not support stories inserted between other stories. They may only be added to the top.
• Only rectangular wall openings are imported. If an opening is not rectangular a bounding box is imported.
• Only rectangular and horizontal isolated foundations are imported.