HARVEST DI'CRSITY INIEX (HDI) This inde> is the same as the DIVERSITY INDEX except that the value of Each harvest of a repeated crop is used rather than the value of ec:h different product. HOMOGENEOUJ FARMER GROUPS Groups of ~ r.aers who farm under similar conditions and in similar wayg so trt the sane recommendation; for changes in TECHNOLOGY can be ma.- to them: See also RECOMiME'DATIOI DOMAIN. HOUSEHOLD A househoi-d comprises the farmer and other family members. It is both .- consu.ming and producing unit, and is a social organization. Households ;re often under the manangErnt of a single person, but sometimes operate collectively. Members normally live and sleep in the same place, share meals, and divide household duties. HYDROMORPHIC Derived fro. hydro (uater) and morph (form). Descriptive of soil developed in the presence of permanent or periodic excess of moisture. INFORMAL tZVEY A survey undertaken without formal. sampling procedures, pretested questionnaires and other proceduvas that permit statistical analysis of the data. See also RECONNAISSANCE SURVEY. INFRASTRUCTURE The supportive feaLures of an economy often provided by government, but sometimes provided by private industry, such as transportation, electricity, water, communications and governmental organizations. PAGE 12