Once again, I have run into a law review that has adopted the convention of using decisionmaking as a one word unhyphenated noun and adjective. I hate to be pedantic about this, but the Chicago Manual of Style still says that decision making is an unhyphenated two word compound noun and a hyphenated two word compound adjective:
FWIW, Word's and Safari's spell checkers agree with me and the Chicago Manual. Granted, I used to use decisionmaking, but I have seen the light and now--like a reformed smoker--become an apostle for the correct usage.
