The Collaborative International Dictionary of English v.0.48:

reassess \re`as*sess"\, re-assess \re`-as*sess"\v. t.
   To revise or renew one's assessment of; as, we need to
   reassess our position to include the new information. Usually
   used without the hyphen.

   Syn: re-evaluate, reevaluate.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

reassess
    v 1: revise or renew one's assessment [syn: reassess,
         reevaluate]