1. INTRODUCTION Management Information Systems (MIS) is the discipline that covers the application of people, technologies and procedures to solve business problems. Academically, the term is commonly used to refer to the group of information management methods related to automating or supporting human decision making, for example Decision Support Systems, Expert Systems and Executive Information Systems (OˈBrien, 1999). With increased computing capacity and high-tech networks to connect the necessary information, MIS has become a standard among many companies (Inc. Encyclopedia, 2014). Summarizing the practical and theoretical dimension of an MIS system, we could say that it helps a company's management make better decisions since all information is collected, filtered and distributed through advanced technological programs. The terms MIS and information system are often confused. Information systems, however, include systems that are not intended for decision making. On the other hand, MIS systems are used to analyze other information systems applied in the operational activities of the organization (OˈBrien, 1999). For the purpose of this document, these two terms are often identical because they are used to make more or less the same basic points. MIS is sometimes defined, narrowly, as information technology management. This area of ​​study should not be confused with computer science. IT service management is a professional-focused discipline. It also has some differences with Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) since ERP and CRM incorporate elements that are not necessarily focused on decision support. CRM and ERP are valuable business software solutions but they are used to manage and ach......half of the document......or the customer's contact with the Bank. This will lead to an increase in customer satisfaction and therefore trust in the Bank which in turn will lead to an increase in the Bank's profits. Customer satisfaction will be improved by increasing the Bank's ability to serve the specific needs of each customer by examining the product/service offered to each customer separately; when it is offered and how. Nowadays, the needs of these customers can only be successfully met with the help of CRM technology due to the huge volume of information that needs to be managed. In the context of information management, the needs, communications, connections, adjustments, behaviors and relationships that customers have developed among themselves, with the Bank, with the products/services, with officials and with the technology available to the Bank.