Basic Impact Assessment At Project Level Page 34

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In well resourced studies with long time scales all of these different methods may be
utilised in a comprehensive fashion. In cases where a high degree of statistical
confidence is required (for example, when it is desired to ‘prove’ impact for policy or
major investment purposes) then a large scale, longitudinal sample survey must be
mounted, preferably supported and triangulated by the use of their methods on a
limited scale. By contrast, if an IA is required to provide independent corroboration
of the impact of a small scale program and strengthen aspects of its implementation
then a mix of rapid appraisal and small scale survey is likely to be appropriate.
Table 3 summarises the conditions in which key methods are, and are not,
appropriate.
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