QLTA reflects the broad investment-grade corporate market reasonably well even as it focuses on bonds with higher credit quality. It includes only those rated AAA to A, and excludes the bonds rated BBB out of its investment-grade universe, sacrificing yield for safety. QLTA also invests across multiple sectors and only requires a minimum maturity of at least one year. Subsequently, it weights each security based on market value, with a cap of 3%. The fund uses a sampling method in tracking the index, meaning it invests in securities that have identical characteristics of the securities that comprise the Index.