The Collaborative International Dictionary of English v.0.48:

Systematization \Sys`tem*a*ti*za"tion\, n. [Cf. F.
   syst['e]matization.]
   The act or operation of systematizing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

systematization
    n 1: systematic organization; the act of organizing something
         according to a system or a rationale [syn:
         systematization, systematisation, rationalization,
         rationalisation]