英文文献：Application of the Programmable Calculator to Extension Agricultural Management Programs
英文文献作者：McGrann, James M.,Edwards, William M.
英文文献摘要：
Extension economists have long struggled with making recommendations to farmers on the basis of "rules of thumbs," which may become obsolete or are not universally applicable, versus encouraging detailed numerical analysis, which, while providing more precise and individualized answers, often involves laborious and difficult calculations as well. Fortunately, the development of computers and electronic data processing has added a new dimension to decision making in agriculture.