modelization of the agric~1tural sector involves a knowledge of the production technologies and of people•s economic beh~viour. In the two examples given above on project anctlysis and sectoral plannlnq models~ the tewel of disaggregation of the data ~as very small, the modets relyinq on farm-survey da~a differentiating between the nature of ownership. etc. One can rou-ghly di st. i ngo'i sh three types of information to be col­ lected: (1) .farm management oat a: production techno I agies, input and out­ put farmgate prices. produ:ction costs according to the different. tech­ nologies. land ana working capital ownership. labour requirements; 12 -lJ - (2) Farl'lers• b~hav,our; fa.-m~rs • consumptio n dlod S<~vinq patterns, attitudes towards risk. use of credit. co-op~rative me~bership; (3) Jhe demcmd ancs marketing of agricultural commo -:htaes: t"e demand for food. the d\jrv-industries• requirement s. tt1e marketing channels organization and profit margins, the wholesale and retai I prices. These data dre typically of a m~cro ·economac nature, in oppo­ sd.:i•.)n to the qu.:dit.ci't .i'le procedural ::·E:quin~·ment~ of :";tacro-economic d;:•'tcJ• .!f 'itt,lt istics about macro-aggregates are rather abundant in the pubi~cations of the statistical organizations in the ECWA countries, information at the micro-level is quite scarce. This l.act< of informd­ tion caA be eKplained by the fo11o~ing problems. f_i!.st.- 21nd IVJ~inly.. the organizational problems encounter ed in collectin g ~icro-type data. Since the disaggregation level is sma•l and some of the 'lata have a strong seasonal component• the systP.matic collection of r.:-:t~ iofcnr<dt.ion implies,. i!!!.~~ !.i!!.:!. the decentr-.il i·­ ~dtion of the statistical offices. the diversific~tion of the data ~~urces together ~ith the systematizing of the targeted sample sur­ v~ys, and the institution of permanent contacts at the Jocal !evel ,tittl t:ne org.1rd.J. ~l~.ion~ ~nvo,ved. in agric..ulturP. {adm!n!st.!'at:h ~o: n~-ope:-atives • .a~.Jr-o-inc1astt·ies .. wholesale llt.Jrkets,). ·Joviously suc:h a 
**Analysis**
The text appears to be discussing the importance of collecting data on the agricultural sector, specifically on farm management, production technologies, and farmers' behavior. It also touches on the challenges of collecting micro-level data and the need for a decentralized approach. Given the focus on agricultural data and the discussion of farm management and production, it is likely that the text is related to the field of agriculture.

**Category**
Agriculture, forestry and fishing, Economic development