[en] Some theoretical and experimental investigations of few-nucleon systems are discussed. Accuracies achieved and also agreement and disagreement obtained in experiments and calculations are considered for nucleon-deuteron and alpha-deuteron interactions at energies below 40 MeV. The special importance of neutron-deuteron system is emphasized. It is shown that three-body model calculations based on the solution of Faddeev-type equations have been successful in predicting scattering and breakup cross-sections for three-nucleon case as well as for the alpha-deuteron system