IIGD takes a defensive approach to corporate debt. The selection pool consists of US dollar-denominated, investment-grade corporate bonds with maturities between 2 and 10 years. The index scores each bond by a combination of credit rating and maturity, favoring bonds with higher credit quality and shorter terms. Maturity and credit rating are weighted at 75% and 25%, respectively. Bonds scoring in the top 40% of the eligible population are included in the index. Constituents are market-value weighted. The Fund and the index are rebalanced monthly.