This is the last of four Market Updates on data discovery, data profiling, data cleansing, and data quality platforms respectively. The question, of course, is what constitutes a data quality platform? At the lowest level this must include both a data profiling tool and a data cleansing/matching tool. We have regarded it as advantageous if the platform can also provide specific capabilities to support data stewards and data governance and, to a lesser extent, if there are particular facilities available to support data migration. We have taken only marginal note of the fact that other capabilities such as master data management and ETL (extract, transfer and load) may also be available.