ABSTRACT
The parton model is the conceptually easiest to understand, although it appears a bit special, as special assumptions seem to be made. In field theory the wave function for a state, such as a proton, could be given by giving the amplitudes to find various kinds of bare field particles moving with various momenta. This chapter provides the incoming proton as a box of partons sharing the momentum and practically free. The ideas leading to the scaling formulas are very reliable. For a particle at rest the state may be described by saying the spin is in some particular space direction s¯. Several models have been made which predict ratios below 1 but above 1/4.
