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HOUSING SUBMARKETS AND SUB~aaRKET AREAS: Within the framework described above, a housing market and a housing market area as whole entities are divisible into component parts. In individual market analyses, they may be segmented in varying degree to serve more effectively the purpose(s) for which each analysis is undertaken. For example, an analysis with a single conclusion that there is a prospective demand for "~' number of additional dwelling units in the subject locality has only general and very limited usefulness; but, if the analysis is developed to segment the demand, e.g., qualitatively and geographically, its value and usefulness are greatly enhanced. DELINEATION OF THE HOUSING MARKET A housing market area is defined as the geographic entity within which nonfarm dwelling units are in mutual competition. Ideally, this definition implies a preciseness in area delineation which cannot be achieved. A technique is not available to determine the exact points at which specific dwelling units are just beyond the range of competition with other units so that the precise limits can be established for delineating the housing market area. Moreover, if such a technique were available, the limitations of available data ~ould preclude its application. Thus, a c~promise is made between the idealistic and the practical aspects of delineating the housing market area with a view to determining the boundaries which will constitute the most reasonable and useful market area from the standpoint of tl~e availability of data consistent with the analytical requirements, having due regard for adjustments that can be made in available data to serve this objective most satisfactorily. Within this framework and the available tools, together with careful firsthand observa- tion throughout the area, the analyst can cumply substantially with the criterion of dwelling unit competition in delineating the housing market area. For the purposes of this study, the City of Santa Aha is identified as a housing submarket of the larger Orange County Housing Market Area. These areas were identified as housing submarket and market areas because of the available transportation facilities that link Santa Ana with the entire C~unty, principal locations of nonagricultural ~ployment, local con~nuting habits and preferences of the citizens of Santa Aha as reflected by the 1970 Federal Census of Population, trends in residential developments, topography and the limitations of statistical information relative to subgeographical areas within Orange County. Observations made in the course of field work for the Santa Ana Housing Element, together with the study of various maps and data available locally, provided the re- quired perspective on the extent and structure or urban de- velopment, its direction of growth and the pattern of its major 00003