accelconf.web.cern.ch/accelconf/e08/papers/tupc122.pdfInternational audienceGoals of ATF2 will be to provide beams with a few tens of nanometers and stability at the nanometer level. To achieve this, several corrections have to be applied as tra- jectory corrections and optics correction. Once the most critical effects are found, they must be canceled by trajec- tory correction and rematching of the optics quickly and efficiently. A method using SVD-determined knobs and how it can be implemented in ATF2 are here described