The best way to reduce the risk of inaccurate or misleading data proliferating through business intelligence systems is to establish rules for converting data from one format to another, because this ensures that the data quality and integrity are maintained throughout the data transformation process. Data conversion rules define the standards, procedures, and methods for transforming data from different sources and formats into a common format andstructure that can be used by the business intelligence systems12. Implementing data entry controlsfor new and existing applications, implementing a consistent database indexing strategy, and developing a metadata repository to store and access metadata are not the best ways to reduce the risk of inaccurate or misleading dataproliferating through business intelligence systems, becausethey do not address the issue of dataconversion, which is a critical step in the data integration process for business intelligence systems. References: 1: CISA Review Manual (Digital Version), Chapter 4, Section 4.3.3 2: CISA Online Review Course, Module 4, Lesson 3