All articles of this category The discovery of nonlinear effects (NLE) is recalled, and the main features of NLE are described. The origin of the nonlinear effects is discussed. The asymmetric amplification is especially considered. The concept on nonlinear effects has been extended to pseudo-enantiomeric catalysts, to chiral reagents and to kinetic resolution. The use of NLE as a mechanistic tool is underlined. asymmetric amplification - asymmetric catalysis - asymmetric depletion - asymmetric synthesis - chiral auxiliary - non-linear effects