The DI is calculated by subtracting the percentage of companies reporting bad business conditions from that of those seeing the opposite. The tankan survey is one of key economic indicators the central bank assesses when determining monetary policy. The DI for major manufacturers' business conditions outlook over the next three months is estimated at plus 13, down 1 point. Sentiment is expected to weaken, particularly among processing companies reliant on exports, amid a global economic slowdown, an official at the Japan Research Institute said. The DI for current business conditions among large nonmanufacturers is forecast to fall 1 point from June to plus 33.