Abstract: “Data quality is a main issue in quality information management. Data quality problems occur anywhere in information systems. These problems are solved by data cleaning. Data cleaning (DC)is a process used to determine inaccurate, incomplete or unreasonable data and then improve the quality through correcting of detected errors and omissions. Generally data cleaning reduces errors and improves the data quality. It is well known that the process of correcting errors in data and eliminating bad records are time consuming and involve a tedious process but it cannot be ignored. Various process of DC have been discussed in the previous studies, but there’s no standard or formalized the DC process. Knowledge Discovery Database (KDD) is a tool that enables one to intelligently analyze and explore extensive data for effective decision making. The Cross-Industry Standard Process for Data Mining (CRISP-DM) is one of the KDD methodology often used for this purpose. This paper review and emphasize”

Keywords: Data Cleaning, Data Mining, DC Process, Missing Value