Also known as desk research as it involves using existing information that has been collected by the third-party for a different purpose for using data from organisations own records. Can be internal, data from the organisations own sales records or customer database. Can be external, which might include government produced data or reports.Advantages can be that it's very cheap and doesn't take much time. Disadvantages can be that date it might be old and irrelevant as of the current time and trends.