Title ofprogram: MULTJ emission of quanta, leading-logarithm approximation Catalogue number: AAVF Nature of physical problem Event simulation of quantum chromodynamics in the process Program obtainablefrom: CPC Program Library, Queen's electron + positron -~virtual photon -+ hadrons at moderate University of Belfast, N: Ireland (see application form in this and very high energies, assuming the leading logarithm issue) approximation and including the multiemission of QCD quanta. Computer: CDC 7600; Installation: CINECA, Bologna; the program has also been run at CERN, Geneva Method of solution Monte Carlo generation of emitted QCD quanta by a proce-Operating system: Scope 2.1.5 and NOS/BE dure developed in ref. [1]. Programming language used: FORTRAN IV, extended Restrictions on the complexity of the problem Applications at low energy are limited to c.m.s. energies High speed storage required: 106 472B wordscan be varied above 5-6 GeV, because ofthe physical approximations according to the choice of parameters involved. At very high energy one may meet limitations associated with storage requirements. No. of bits in a word: 60 Typical running time Overlay structure: none At a c.m.s. energy of40 GeV, 0.02 s per event on average Other peripheralsused: line printer Unusual features of the program No. of cards in combined program and test deck: 1923 A random number generating routine should be added. The sample driving program requires the addition of externals, as Card punching code: BCD specified.