References will be provided so that those interested in these topics can find additional information. Because the purpose of this workshop is to show the use of the mixed command, rather than to teach about multilevel models in general, many topics important to multilevel modeling will be mentioned but not discussed in detail. Such models are often called multilevel models. Although it has many uses, the mixed command is most commonly used for running linear mixed effects models (i.e., models that have both fixed and random effects). The purpose of this workshop is to show the use of the mixed command in SPSS. Using the SPSS Mixed Command Introduction