DASi is a computer- system developed by the Food and Agriculture Organization of the United Nations {FAO) for processing data reqofred for proJeCt anatysis. ~~also enabtes the analysis of ~nmerous varf­ ants of the project. The programme uses mainly theoretical data. i.e. data generated by eKperts according to the project characteristics and expectations. The estimation of these data (e.g. expef"imental plots) faiJs beyond the sco?e of this paper. Yet at the same time, informa­ tion on the actual situation. i.e. the situation •without project ... is requested for: (a.) Adjusting the expef" i menta 1 data to the 1 ocal environment; and (b) Buitainq a simu1ation of the most likely project area if no project were to be itaplemented. development of the The collection of these data is carried out through hold­ ing;househofd surveys, the data being organized in two brodd catego­ ries: the activity section and the price section. This data section gives an estimate of the input/output coeffi­ cients of the agricultuf"al activities undertaken in the project area. For purposes of simplificati 'on only field crop production projects will be considered here• but the processes af"e the saee for a Jiwe­ s tocf< or fishery development . project. for crop product ion, the coef­ ficients of output are typically the yields• not only the yields of the main commodaties but also those of the by-products which represent a si.zab1e share of the gross p1"'oduction vdlue. For example~ the returns from the self ing of straw to I ivestock pt""oducers may repn~s ent up to 40 pet' cent of the gross returns of cereal production in the rain-fed areas of lf"aq and Jordan. Since yield estimates are general­ ly an estimate of the bio1ogica1 yields observed in the fields• they must be corrected by estimates of post-harvest tosses and wastage dur­
**Analysis**
The text appears to be discussing a computer system used for analyzing data related to agricultural projects. The system is used to estimate input/output coefficients of agricultural activities, including crop production and livestock. The text also mentions the importance of correcting yield estimates for post-harvest losses and wastage. Based on this information, it seems that the text is focused on agricultural development and the analysis of agricultural projects.

**Category**
Agriculture, forestry and fishing