Calorimetry at the Linear Collider

The potential to extract physics at the International Linear Collider depends critically on the jet energy resolution of the detector. The design goal is 30%/sqrt(E), which is roughly a factor two better than what has been achieved previously. After a short review of the Linear Collider project, I will discuss a novel approach to the measurement of jets and the resulting requirements on calorimetry. I will present the ongoing vigorous R and D program geared at designing and testing the technical implementation of these new ideas.