Methods are presented which indicate how special tabulations of census data may be used to supplement the usual agricultural census data in arriving at important type-of-farming areas in the State and in determining the typical farming systems for different sizes of farms in each area. Examples are also given illustrating how these typical farming systems may be used in conjunction with production and price information in testing out and appraising the profitableness of different types of farms as well as long-time and year-to-year adjustments in different farming systems.