In an ideal world, each customer would provide Complexica with a clean and complete data set, which is well documented and highly structured. In reality, however, this is rarely (if ever) the case. Our experience with data is that most organisations suffer from missing, incomplete, and inaccurate data (i.e. dirty data) which needs to be evaluated during the scoping phase and addressed during the software deployment phase. Because today's data comes from increasingly disparate sources and in an ever-growing variety of forms, it usually needs to be prepared to become usable. During the data cleaning process, corrupt or inaccurate records are corrected or removed from a record set, table, or database, and incomplete, incorrect, or irrelevant parts of the data are replaced, modified, or deleted. Unsurprisingly, this process (often referred to as data cleansing”) can be demanding, but pays dividends during the software go-live phase and during usage thereafter.