(76)The best execution obligation under Directive 2004/39/EC requires investment firms to take all reasonable steps to obtain the best possible result for their clients. The quality of execution, which includes aspects such as the speed and likelihood of execution (fill rate) and the availability and incidence of price improvement, is an important factor in the delivery of best execution. Availability, comparability and consolidation of data related to execution quality provided by the various execution venues is crucial in enabling investment firms and investors to identify those execution venues that deliver the highest quality of execution for their clients. This Directive does not mandate the publication by execution venues of their execution quality data, as execution venues and data providers should be permitted to develop solutions concerning the provision of execution quality data. The Commission should submit a report by 1 November 2008 on the market-led developments in this area with a view to assessing availability, comparability and consolidation at a European level of information concerning execution quality.