Delta model (after the Greek letter Delta, standing for transformation and change) is a customer-based approach to strategic management.[1][2][3] Compared to a philosophical focus on the characteristics of a product (product economics), the model is based on consumer economics. The aim is to create a very strong bond between the company and its customer or its complementors (other products and services in the same business ecosystem).[4] The customer-centric model was developed by Dean Wilde and Arnoldo Hax. The model was first thought about at a confab of alumni that took place at Massachusetts Institute of Technology (MIT).[5] The development of the delta model created a large amount of research into the drivers of sustainable profitability for businesses.[6]