To determine the viability and efficiency in the implementation of strategies for the Customer Relationship Management in the large non-financial companies in the city of Medellín, the first step was taking a look at North America –United States and Canada–, to have a reference point in a dynamic market where CRM is the fundamental basis of relationship strategies. Some cases of successful implementation of this methodology in the companies were analyzed, as well as theories held by highly regarded authors. It was also necessary to determine the advantages and disadvantages that come with the implementation of a CRM strategy; therefore, secondary information was analyzed to explain why it is good to implement relationship strategies and the obstacles or problems that brings its execution. Using in-depth interviews, the existing CRM theory and the reality of its implementation in large non-financial services companies of Medellin was corroborated and contrasted.