Hello, viveca6,
It all depends on what you want to do. See this thread for the differences/similarities of the two:
http://allnurses.com/forums/f119/dif...do-182191.html
I see you asked about phasing out the CNS in another thread. Many states combine the two, NP and CNS. I know Illinois does. traumaRUs is a CNS in Illinois and an administrator here. You might ask her about this.