Case Study: Designing a CRM System

You’ve been asked to design a customer relationship management (CRM) system. This CRM system needs to provide a single view of customers using information stored in different data sources. Address information of all the customers (walk-in and online) is stored in one data source. Other information (e.g., name, phone number, etc.) about online and walk-in customers resides in two additional data sources—one for walk-in customers and one for online customers.