 In April 1999, the Government introduced a voluntary "CAT" standard for ISAs (standing for "Charges, Access, and Terms") to make them easier for inexperienced customers to understand and with the intention that lower costs would attract more investors.The standard does not guarantee the investment performance or that investors would buy or be sold the right type of investment.Many equity funds also meet the CAT standards, but the restriction on costs generally means that these funds are index funds, which require little management and simply follow a given index, such as the FTSE 100 Index.