This paper presents an effective Lagrangian analysis of new interactions with a scale Λ larger than the Fermi scale G_F^{-1}. The authors construct the first two terms of this Lagrangian in an expansion in powers of 1/Λ and study possible effects of new interactions such as anomalous magnetic moments, deviations from universality in weak interactions, and rare processes. They find that the universality of the charged current weak interactions yields the strongest bound on the new interaction scale, Λ > 5 TeV, whereas flavour non-conserving processes imply the bound Λ > 3000 TeV. The authors emphasize the importance of searching for rare decays of D-mesons. They derive conditions for natural flavour conservation and discuss the problem of flavour-changing neutral interactions in l_2. The paper also discusses the effects of new interactions on the masses and couplings of the W and Z bosons, the Fermi constant, the weak angle, the ρ-parameter, the Higgs couplings, and the Higgs mass and self-interaction. The authors conclude that the effective Lagrangian approach is a powerful tool for studying new interactions and their effects on the Standard Model.This paper presents an effective Lagrangian analysis of new interactions with a scale Λ larger than the Fermi scale G_F^{-1}. The authors construct the first two terms of this Lagrangian in an expansion in powers of 1/Λ and study possible effects of new interactions such as anomalous magnetic moments, deviations from universality in weak interactions, and rare processes. They find that the universality of the charged current weak interactions yields the strongest bound on the new interaction scale, Λ > 5 TeV, whereas flavour non-conserving processes imply the bound Λ > 3000 TeV. The authors emphasize the importance of searching for rare decays of D-mesons. They derive conditions for natural flavour conservation and discuss the problem of flavour-changing neutral interactions in l_2. The paper also discusses the effects of new interactions on the masses and couplings of the W and Z bosons, the Fermi constant, the weak angle, the ρ-parameter, the Higgs couplings, and the Higgs mass and self-interaction. The authors conclude that the effective Lagrangian approach is a powerful tool for studying new interactions and their effects on the Standard Model.