linguistic:paraphrasing
Sensitivity

The principal purpose of the evaluation process is to measure whether the program has an effect on the social problem it seeks to redress; hence, the measurement instrument must be sensitive enough to discern these potential changes (Rossi et al., 2004). A measurement instrument may be insensitive if it contains items measuring outcomes which the program couldn't possibly effect, or if the instrument was originally developed for applications to individuals (for example standardized psychological measures) rather than to a group setting (Rossi et al., 2004). These factors may result in 'noise' which may obscure any effect the program may have had.