- 20 - Adequate provision of the new inputs must be assured and most often these come in a combination or "package" so that not one but all must be readily available before adoption will take place. A fertilizer responsive new seed might be available, but it will be of limited value to the farmer unless fertilizer is also available. These six are neither mutually exclusive nor the sole determinants of resistance; they also frequently interact with each other in a particular situation. Some additional comments are in order regarding technical viability and economic feasibility. The history of past technical assistance is littered with instances where a "new technology" which is labelled as both "new" and (automatically?) "better" has in fact proven to be unsuited and not technically viable. Some of these failures have been due to the improper recognition of the non-transfer- ability of temperate zone technologies to tropical and sub-tropical zones. Less crude but equally common have been those failures due to an inadequate recogni- tion of the need for adaptive research which will take a new technology and reshape it to fit specific growing conditions. Still other instances of failure can be attributed to "slippage" which occurs due to such factors as poor seed multiplication or improperly trained extension agents. While such considerations are of the greatest importance, in the analysis which follows they will be ignored because for our purposes they do not really constitute a "new technology" at the farm gate. The following analysis, therefore, will assume that the technology being discussed is in fact "new" in the sense that it is technically viable, technically superior (at least in so far as higher average yields), and adequately adapted and locally tested for use by individual farmers. Even under these circumstances there remains a sizeable question regarding the economic feasibility of the new technology.