This report, resulting from the Context Information Processing Project, is a review of request language and search logic in its present state with the purpose of relating these findings to the design of QUERY (the language described in LI 001 652) and to context information processing needs. A basic assumption is that an information retrieval system should be adapted to the user's method of organizing information, rather than vice versa. Initially, the review attempts to identify as many search languages as possible and to classify these according to their form. A description of each classification, together with a list of the languages so classified, is provided. Later, in the comparative analysis of the capabilities of search languages, only three representative languages are considered. In this analysis, an illustrative English request is given and the equivalent statement in each search language is examined for its ease and power of expression. The effects of each type of request upon the user and the requirements for implementing that request are discussed. The report suggests that though this approach is cumbersome, no formal method has yet been established for measuring search language capabilities. (RM)