| A | B |
| People | design systems, operate them, and benefit from them. |
| Capital | money or other form of wealth used provide resources needed in a system. |
| Energy | the capacity for doing work and comes in many forms. |
| Material | the physical substances that are used in a process. |
| Tools and Machines | used to extend the natural capabilities of people. |
| Information | we collect it, think about it, and apply it to meet our wants and needs. |
| Time | a measurement that is increasingly important in our information age. |
| Resources | the things needed in a technological system to get a job done. |