Profit and revenue for the Bureau of National Affairs rebounded for the year ended December 31 with its software operations continuing to produce a disproportionate amount of the company's operating profits. BNA net income rose by 58 percent, largely because of lower expenses, while revenue was virtually unchanged. However, the software segment, which includes BNA Software and STF Services Corp., produced 24 percent of the operating profit even though it represents only 9.4 percent of revenue.