A new string/cluster model for e +e − annihilation is presented. Event evolution is described using a simple, 3-stage formalism: (i) coherent parton shower generation, (ii) evolution of elementary strings formed from the parton final state, and (iii) parameterized hadronization of small mass clusters formed during string evolution. Significant improvements over previous cluster models arise from the use of full, massless relativistic string motion in the second stage of the model, so that the formalism is naturally insensitive to soft perturbative radiation. Parameter fitting and sensitivity of model predictions to variations in the cluster formation parameters are discussed in detail. The model is shown to reproduce a variety of e +e − annihilation data over a wide range of E CM. Specific suggestions are made for future improvements in the perturbative QCD and cluster decay stages of the model.