Properties of superfluid 3He near the normal phase boundary and recent neutron scattering measurements have yielded new information about the quasiparticle interactions in 3He. For this reason these measurements have instigated the construction as well as reexamination of several phenomenological theories of the normal liquid. Among these are the paramagnon model and its generalizations and the polarization potential approximation. A review is given of these and other phenomenological models for liquid 3He and their relationship to Landau Fermi liquid theory. Quantitative comparison with experiment at different pressures for the neutron cross section, the superfluid transition temperature, the specific heat discontinuities at the superfluid phase boundary and transport properties are discussed at length. Recent advances based on kinetic theory and the dichotomy of the "localization" versus "spin fluctuation" viewpoints are summarized.