There will be a maximum of 5 observations on each subject in the sample (over the 5 time periods). The primary interest is in the regressions of asthma control on time of assessment. The model includes these regressions with the parameters assumed to be fixed; these fixed regressions will be specified separately by ethnic group. The test of homogeneity of these regressions will be a primary research interest. Non-homogeneity of these regressions would suggest ethnic group differences in the relationship between time and asthma control. Individual regressions of asthma control on time for each subject will also be included in the model. These regressions will be random because they are associated with levels of a random factor (subjects). They can be regarded as deviations from the overall fixed regression. Henderson202 discusses methods for random regressions and the assumptions regarding them; the analysis of mixed models (fixed and random effects) of this type, and tests of homogeneity of regressions in mixed models. Because the investigators hypothesize that the level of acculturation could potentially influence the results, it will be included as a covariate in the model. Following conventions outlined by Kline,Byrne,and Cudeck & Browne,our criteria for assessing adequacy of fit will be: chi-square to df ratio of less than 2, comparative fit index (CFI) and Tucker-Lewis Index (TLI) at or above .90, and a root mean square error approximation (RMSEA) at or below .08.