This paper aims at developing a practical system which makes use of, more effectively and promptly, the results of LLLSC (see the previous papers (1, 2) ) with 4 land utilization types in the adjustment of village land use planning.
This system is a further development of LLLSC with 4 land utilization types, and also is considered to be a methodology to match the target value in land use planning with results (computation value) of LLLSC with 4 land utilization types.
It is made clear that the target value in land use planning could be converged by iteration method. The land suitability evaluation value is weighted, and to iterate until convergence is obtained to the target value.
The good understanding of details, which is the attribute and relationship of land suitability evaluation value each 4 land utilization types, and charateristics of the logic to determine the low-level land use suitability, is found very important in obtain convergence more promptly to the target value in land use planning.

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To make effective land-use Planning in rural areas like in urban areas, it is necessary to grasp the locational structure of housing and industry and so on. This paper discusses some quantitative relationships between urbanized land-use in villages and their distance to the central place within a plain by taking Nagahama City, Shiga Prefecture, Japan as a example.
Since gravity model suggests that there exists population potential resulting from central place over its surrounding area, we set up a model that describes relationship between the potential and urbanized land-use of villages surrounding the central place. The model reveals that there exists a population turning point, and also a time turn point relevant to this population turning point, when central place begins to have an obvious influence over the condition of land-use in the surrounding rural area. By means of the model we get the following conclusions.
1. When the influence from central place is small, the rate of each kind of land-use in villages takes some certain value. Along with development of the central place, the further the distance to the central place, the lower the rate of urbanized land-use, housing land-use and industrial land-use, while the higher the rate of agriculture land-use. And this kind of relationship becomes stronger over time.
2. From a micropoint of view too, location of housing in rural area strongly moves towards central place over time. Meanwhile, the place where housings begin to concentrate have a further distance from the central place than the place where industries and services do so.
3. It is derived theoretically that in Nagahama area the time turning point would have been between 1926-1927. This is supported by historical facts showing a big change in many fields in Nagahama area at that time.

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To clarify the factors of recent population change in depopulated rural settlements of Japan, this paper first defines 1, 301 marginal remote villages from all agricultural settlements listed in the 1970 agricultural census, in the snowy area of 8 prefectures of Tohoku and Hokuriku districts. Second, it reveals some characteristics of the changing tendency in number of households during the 1970s and their general factors by using the methodology of Hayashi's quantum theory I and Automatic Interaction Detector (AID) . Two groups of particular settlements, that have largest plus or minus values of residuals about the estimation of households number by quantum theory I are then classified as “surviving group” and “declining group” respectively. Finally, factors that effect the formation of large residuals of particular settlements are analyzed. As a consequence, following findings are obtained.
Snow depth and the number of days of social isolation with snow strongly affected households' increase/decrease status of marginal mountain villages belonging to the snowy area during the 1970s. Moreover, economic conditions related to family farm management and labor for non-agricultural sector, and location of villages in relation with the accessibility for regional facilities are also found to be important factors.
Agricultural and transportational conditions are frequently mentioned as the reason of peculiar increase/decrease status of large residual villages by municipal officials answered to a postal inquiry. In “surviving group”, a subjective factor namely a solidity of unity and cooperation in a community is most frequently pointed out. Implementation of regional or tourist development is also frequently suggested as a concrete factor of the peculiarity of “surviving group”.
A large variance which may not be perfectly explained with a consideration of general factors is found in the trend of marginal mountain villages in the snowy area. The variance may reflect some subjective factors of village inhabitants. Possibilities of successful survival of marginal villages should remain within this range of the variance.

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