From WordNet (r) 1.6 [wn]:

  evaluation
       n 1: act of ascertaining or fixing the value or worth of [syn: {rating}]
       2: an appraisal of the value of something [syn: {valuation}, {rating}]

Information which is evaluated can then participate in the process of knowledge evolution. If it is not evaluated it has little meaning. Third in a process of expression, transmission and evaluation.