DocuScope is a text analysis environment with a suite of interactive visualization tools for corpus-based rhetorical analysis. Designed as a tool for rhetorical analysis, it's also extremely effective for developing the dictionary in a systematic fashion. The tool uses a collection of lists called "Language Action Types," or LATs, each of which contains words believed to belong to a given conceptual category. Words that designate "Positive Emotion" constitute one LAT; words that are associated with orality make up another LAT, and so on. DocuScope reads documents in and measures the degree to which each parsed document contains words from each of the LATs. Users may customize the LATs, and may visualize the results in various ways.