  Current and future colliders will provide high precision experimental data.
In order to use the high experimental precision it has to be matched with
theoretical predictions at the same level of accuracy or better. This involves
the calculation of loop corrections at increasingly higher order. We briefly
review the status of the field, especially in view of the calculations
presented at this conference. We give an outlook about the theoretical
requirements for the anticipated precision of a future e+e- linear collider.
