This paper defines the information system, its parts, and functions. The focus is on CRM systems, which support the customer relationship management. We analyzed the efficacy of the existing information system in a store and the process of introducing CRM into it. With the introduction of CRM, the new objectives for the system will be set, and the new system will be proposed based on how well it meets these set objectives. Evaluation will include the system’s criteria as well as the assessment of the existing system against those criteria. The proposed new system is expected to facilitate product acquisition and increase competitive advantage. The two-way communication is expected to increase recorded sales per customer and acquisition of new customers and reduce costs by improving business processes and customer relationships – thus increasing customer loyalty. The goal of CRM system is to convert the valuable customer information data into customer knowledge. This customer knowledge must be recorded, stored, available, and accessible for analysis – in order to enable the sales teams to use the results for better understanding of past and present sales environments to be able to predict future business results.