Many threads here (and postings out there in the web) deal with troubles regarding ISI's Impact Factor and denying its usefulness for evaluation of scientific impact. On the other hand, a lot (if not the majority) of institutions use the IF to evaluate faculty.
Is there a definition of "impact of a paper", which can be accumulated for an individual researcher and can be agreed upon by authors and committees? If not, what can be done to support institutions in finding appropriate candidates for positions?