279 TURNOVER F: CHIFFRE D'AFFAIRES S: ENTRADA BRUTA The total of RECEIPTS in a given period. 280 TWO-PHASE SAMPLING F: ECHANTILLONNAOE EN DEUX PHASES S: MUESTREO EN DOS FASES A form of MULTI-PHASE SAMPLING involving data collection from two subsamples. 281 UTILITY F: UTILITY S: UTILIDAD A numerical measurement of a decision maker's relative preference for possible consequences. 282 UTILITY FUNCTION F: FUNCTION D'UTILITE S: FUNCTION DE UTILIDAD Mathematical function that relates different levels of individual goal satisfaction uith UTILITY levels. Because monetary revenue is an easily measurable goal, the utility function frequently is expressed in terms of this variable. 283 VALIDATION F: VALIDATION S: VALIDACION The process of ascertaining if the output reality to a satisfactory degree. 284 VALUE OF PRODUCTION F: V S: of a MODEL mimics ALEUR DE LA PRODUCTION VALOR DE LA PRODUCTION For a FARM as a whole, is identical to GROSS FARM INCOME. F: CHARGES VARIABLES S: COSTS VARIABLES Those components of total farm COSTS that are variable in the sense of changing according to the scale of the ACTIVITY or ENTERPRISE in which they are incurred. They may be in the form of PAGE 55 ENGLISH 285 VARIABLE COSTS