It is worth noting one caveat to this approach. Any conclusions will be based on comparing temporary workers with those most similar to them in their human capital and demographic characteristics. This will be interpreted as an estimate of the impact of temporary work for those who worked for a temporary agency. It can also be reasonably taken as an estimate of the effect of temporary work for those with human capital and demographic characteristics quite similar to those who worked for an agency. However, our estimates cannot provide a measure of the likely effect of temporary work for persons with characteristics quite different from those of the temporary workers or for a broader group, such as all persons on welfare.(67) The conclusions drawn from this analysis, although narrower in scope, are expected to be more reliable and in keeping with the primary research question.