The investment seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the ISE High IncomeTM Index (the "index"). The fund will normally invest at least 80% of its total assets in securities of the index. Because the index is comprised of securities issued by other investment companies, the fund operates in a manner that is commonly referred to as a "fund of funds," meaning that it invests its assets in shares of funds included in the index. The index seeks to measure the performance of the top 30 U.S. exchange-listed closed-end funds.