(71)The scope of the advice given by investment firms on an independent basis could range from broad and general to specialist and specific. In order to ensure that the scope of the advice allows for a fair and appropriate comparison between different financial instruments, investment advisers specialising in certain categories of financial instruments and focusing on criteria that are not based on the technical structure of the instrument per se, such as ‘green’ or ‘ethical’ investments, should comply with certain conditions if they present themselves as independent advisers.