| HCD vs TCD | The system is user centric. If the user is not satisfied with the system, he stops using it. | The system is task centric. If the user is not working properly with the system, he can be trained or replaced. |
| Complexity vs ease of use | The system should be as simple as possible. Secondary usage scenarios can be skipped for ease of use. | Ease of use is important for efficiency, but if the subject matter requires multiple was of operations, most of them should be included, especially for safety-critical systems. |
| Purchase options and marketing | Marketing of the system is user centric. The marketing efforts are also included to the product to support additional purchases and user loyalty. | Marketing is sales and business centric. Because typically the user is not buying the system, in-product marketing is useless. |