. This material was shipped to Fenwick Library Special Collections, George Mason University, Fairfax, VA on 23 October 2000. This paper comprises part of the theory needed for writing ISM software, giving techniques for correcting structural defects (e.g. non-regular hierarchical structures) when using Interpretive Structural Modeling. The paper was included as part Warfield's GRAILS, as an appendix. The four pages of printed text include one Table showing combination of structural pairs, and one Figure Fig. 1 Part of municipal priority structure.