POSSIBLE CONNECTIONS BETWEEN HARD AND SOFT PROCESSES*

Three topics in constituent hadron models are reviewed: the connection between fixed angle and Regge behavior, the validity of the hard scattering expansion and restrictions on the effects of the transverse momentum of Constituents, and the x-distribution in the fragmentation region at low trans-verse momentum. In this talk I would like to restrict myself to a brief discussion of three topics: (A) connections between fixed angle scattering and Regge theory, (B) the validity of the hard scattering expansion and possible internal motion of constituents, and (C) the x-distributions of beam fragments at low trans-verse momentum. A There seems to be nothing new in this subject but the original treat-ment1s2 was sufficiently long ago (1973) and sufficiently obscure so that a review is probably warranted. In the normal Regge treatment one assumes that the cosine of the crossed angle is large and makes an appropriate power series expansion. Since this requires that s =-u>>-t, the fixed angle region of t x u is not allowed. However, let us approach this problem from another point of view. Write the scattering amnlitude as a sum of Mandelstam double spectral terms (the full Mandelstam really necessary for the argument) M(s, t), M(s, u), and I s I> so(t) M has the behavio