This study presents Portuguese category norms for children of three different age groups: preschoolers (3-to 4-year-olds), second graders (7-to 8-year-olds), and preadolescents (11-to 12-year-olds). Three hundred Portuguese children (100 in each group) completed an exemplar-generation task. Preschoolers generated exemplars for 13 categories, second graders generated exemplars for 17 categories, and preadolescents generated exemplars for 21 categories. For each group, responses within each category were organized according to frequency of production in order to derive exemplar-production norms for sets of tested categories. The results also included information about the number of responses and exemplars, idiosyncratic and inappropriate responses, and commonality and diversity indexes for all the categories. A comparison of these children's norms with the Portuguese adult norms was also presented. The full set of norms may be downloaded from www.psychonomic.org/archive. Categorization provides our mental life with a sense of organization, allowing for the grouping of relatively diverse world entities into similar mental representations. This seems to be an advantage for our cognitive system because it contributes to efficient perception, communication, reasoning, andmemory operations. The categorygeneration task is onef the empirical procedures used to explore how categoric information is organized in our minds. In this task, pa*icipants are instructed to generate exemplars of categories, after being prompted by the name of the category. Descriptive and computational analyses of the responses provide useful information about specific features of categories-for instance, exemplar dominance, exemplar typicality, and category size.