Ex-post evaluation of scenarios: the case of nanotechnology societal impacts

Scenario development is one of the popular methods of futures studies. There has been a lot of attention paid to different methods of scenario writing in theoretical literature; but what is important is to evaluate the scenarios which has not been a matter of comprehensive study heretofore. In this paper, we have carried out a comprehensive study in this regard. Accordingly, evaluation has been divided into three categories: ex-ante evaluation, mid-term evaluation and ex-post evaluation. Ex-ante evaluation is carried out when the scenario is generating; mid-term evaluation is carried out when the scenarios are transferring; and ex-post evaluation is being done after the transfer of scenarios. It should be noted that main purpose for ex-ante evaluation is considered "effectiveness", for mid-term evaluation "relevance", and for ex-post evaluation "the impact". The outstanding part of this paper is the ex-post evaluation of scenarios for societal impact of nanotechnology, (which is carried out in accordance with a former paper) whose corresponding National Iranian Nanotechnology Initiative (NINI) time began approximately 10 years ago.