[en] Novel correlation and scaling methods developed to replace mechanistic analyses of aerosol behavior in the Modular Accident Analysis Program (MAAP) code are reviewed and evaluated as to their present and potential reliability. The initial version of the correlation procedure is found to suffer from inaccurate scaling and some faults in details of implementation. Comparisons with aerosol experiments are made that show unimpressive performance by this version as implemented. An improved version is found to be based on much more satisfactory scaling and to compare favorably with a limited range of experiments. Moreover, its performance is reasonably competitive with mechanistic analyses for two practical scenarios. It is concluded that the initial version should be superseded by the improved version, which is potentially quite valuable but should be tested against a wider range of experimental results that are available or are becoming available. A treatment of hygroscopic aerosols in steam atmospheres proposed for use in MAAP is also examined. It is found to be quite interesting theoretically and to survive comparison with one series of experiments, but alternatives are not excluded and the range of validity of some of its assumptions is unclear