Parity and time-reversal symmetry violating components of the nucleonnucleon interaction play an important role in understanding the main features of the Standard model. These symmetries have been rather intensively studied during the last decade. Moreover, new spallation neutron facilities, such as the SNS at the Oak Ridge National Laboratory and the J-SNS at J-PARC, may provide new data of very high accuracy. In this presentation, we review the current status of the theoretical calculations

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... parityviolating and time reversal invariance-violating observables in few-nucleon systems. In particular, we concentrate on the low energy nucleon scattering on mass A=1-3 targets, as well as on nuclear EDM calculations for A=2-3 nuclei. a