The generation model and the origin of mass

The origin of mass in the standard model of particle physics is discussed and some difficulties pointed out. An alternative model, the generation model, will be shown to lead to a different concept of mass: the mass of a body arises from the energy stored in the motion of its constituents, so that if a particle has mass, then it is composite. It is suggested that gravity is a residual interaction arising from the incomplete cancellation of the super-strong color interactions, which bind the fundamental constituents (rishons) of leptons and quarks.