Introduction. Stochastic Simulation for Imaging Spatial Uncertainty: Comparison and Evaluation of Available Algorithms; C.A. Gotway, B.M. Rutherford. An Extension of the LU Decomposition Method of Simulation; P.A. Dowd, C. Sarac. Discussion following Session No. 1: Chairman J.-P. Chile. Stochastic Simulation and Conditioning by Annealing in Reservoir Description; B.K. Hegstad, H. Omre, H. Tjelmeland, K. Tyler. Conditional Simulation of a Gaussian Random Vector with Nonlinear and/or Noisy Observations; X. Freulon. Discussion following Session No. 2: Chairman A. Galli. Conditional Simulation for Mining: Practical Implementation in an Industrial Environment; P.J. Ravenscroft. Random Media and Lattice Gas Simulations; R. Bremond, D. Jeulin. Discussion following Session No. 3: Chairman M. Armstrong. Theory and Practice of Sequential Simulation; J.J. Gomez-Hernandez, E.F. Cassiraga. Discussion following Session No. 4: Chairman P. Ravenscroft. Reminders on the Conditioning Kriging; C. de Fouquet. Nonconditional Simulation of Stationary Isotropic Multigaussian Random Functions; C. Lantuejoul. Discussion following Session No. 5: Chairman P. Dowd. Modelling the Karstic Medium: a Geostatistical Approach; O. Jaquet, P.Y. Jeannin. Simulating a Geological Lithofacies with Respect to Connectivity Information Using the Truncated Gaussian Model; D. Allard. Discussion following Session No. 6: Chairman H. Omre. The Pros and Cons of the Truncated Gaussian Method; A. Galli, H. Beucher, G. Le Loc'h, B. Doligez. Conditional Simulation of Facies Architecture in Fluvial Reservoirs; F. Georgsen, T. Egeland, R. Knarud, H. Omre. Discussion following Session No. 7: Chairman C. Daly.