4.3 Selection of methods for the evaluation of different variables
The relative appropriateness of different methods for the evaluation of
priority technology performance variables is shown in Table 6. These reflect
the authors' judgement, based on the review of project experiences.
Specific methods may be most efficiently used if they combine the assessment
of several variables. For example, on-farm plot monitoring may be
used to evaluate both economic yields of components and soil erosion
control functions. The combination of different methods in a technology
evaluation programme was discussed in section 4.1. All technology evaluation
activities should involve extension staff and farmers in selecting priority
information needs, assessment criteria and methods of implementation.
Projects can take advantage of the rich opportunities for participatory
evaluation provided by their close and regular contact with wide farmer
networks.