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lv SUPPLEMENTARY INFORMATION The basic premise underlying the conclusions and recommendations of this report is that residential slabs-on-ground cannot be con- sidered nor designed as an entity, separate from natural and man- made surroundings. If maximum economy and performance are to be realized, slab design should be interrelated with site conditions, type of superstructure, and quality control in erection. Sites with sensitive soils subject to volume changes, and sites in areas where climatic conditions develop great variance in soil moisture, make necessary the use of stiffer and stronger slabs than sites with less sensitive soils and steadier climate. Slabs which do not support walls and load-bearing partitions can be allowed to have larger differential settlements than slabs which do. Also, the required rigidity of a slab depends directly on the type of superstructure carried, i.e., the more unyielding the superstructure, the less differential slab settlement can be accommodated without damage to the superstructure. Finally, the performance of the slab, in accordance with the conditions provided by its design and/or speci- fications, will depend greatly upon the quality of materials used. In the pages which follow, factors which influence slabs-on- ground performance are analyzed and procedures are set forth for the systematic introduction of these parameters into the selection and specification or design of specific slab types. Background information related to these parameters, especially fundamental information on soil behavior and quality control, appears at the end of this report, which it Carl be referred to without causing discontinuities in the presentation of the analytical and design 29