Quality Triangle
If you've done any sort of formal training, or first year university IT or business classes, you may be familiar with the quality triangle. The quality of a product depends on your ability to balance the factors at each point of the triangle - Time, Scope, Budget.
For us UX designers we work in a different triangle which I'd like to introduce - the triangle of needs.
Triangle of Needs
UXers need to balance the business needs, the user needs and the tech needs. The inside of the triangle is the "needs", or the requirements / stories for the Product to be built.