In this study, the steady-state, one-dimensional WEN II and DENN-1D fixed-bed gasifier models were compared theoretically and with experimental data to determine their advantages and disadvantages in predicting the operating characteristics of fixed-bed gasification. Initially, the models were compared in terms of their major assumptions, limitations, and unique characteristics. Many of the major assumptions in the models are similar. The main differences occur in the way the models handle drying of coal, predict devolatilization, and represent the kinetics of gasification and combustion reactions. To test the predictive capabilities of the model, each was run with Pittsburgh No. 8 and Illinois No. 6 bituminous coals, Montana Rosebud subbituminous coal, and North Dakota Indianhead lignite. Both air- and oxygen-blow cases were tested as well as both dry-ash and slagging operation. The dry-ash cases utilized data from the METC, General Electric (GE), and British Gas Corporation (BGC)/Lurgi dry-ash gasifiers. Data from the BGC/Lurgi slagging gasifier and the former Grand Forks Energy Technology Center (GFETC) gasifier were used for the slagging gasification cases. In all, 12 cases were tested, 10 dry-ash and 2 slagging cases. Results are discussed. 14 refs., 38 figs., 14 tabs.