Printed together in the same issue are letters from Warfield & Siu, giving Ralph's response to Warfield's open letter advocating a structural model of the Panetics Society goals. Warfield's itemized list of criteria for a good model is given, with short paragraphs on Premature Quantification, Model Structuring, Element Designation, Shared Linguistic Domain, Carefully Selected Relationship Type, Use of ISM, Time Allotment, Preparing a Written Interpretation of Model Structure and Incorporating Quantitative Aspects. A copy of this paper and the entire January 1996 issue of Panetics was saved in Warfield's Works in Progress note-binder where he was collecting materials for a possible book to be called “The Evolution of Systems Science.”