Stam, D.A.

vision leadership follower focus research safety study behavior leader vision communication participant performance promotion effect management transformational communication prevention focus prevention transformational leadership promotion focus journal transactional leadership selves model safety performance speech condition future psychology empowerment effectiveness crisis manager organization process accident transactional 2009 john wiley group vision effectiveness warehouse result identity employee promotor knippenberg van knippenberg higgin theory instance shamir measure manipulation value innovation fi ndings creativity relationship individual image motivation appeal situation factor safety consciousness company prevention-appeal system respect vision manipulation vision content analysis team identity control score fluence promotion-appeal strategy change