Akzo Nobel Inc., Chicago, is conducting an asset allocation study of its $450 million pension plan, said Nancy Dummer, manager retirement benefits. The plan conducts a study every three years, Ms. Dummer said. Manager changes could result if plan officials change the asset allocation model, currently 60% equity and 40% fixed income, she said. The review will be finished Sept. 19, she said. Towers Perrin is assisting.