We are formulating design guidelines for a knowledge system that is to provide answers to natural language queries in context. A query that starts out being very vague is to be sharpened with the assistance of the system. Also, the response to a query is more meaningful when presented in context. We recognize three types of context: essential, reference, and source. Essential context associates the response to a query with a time and place. Reference context provides reference values that help the user determine whether the response to a fuzzy query is true or false. Source context relates to the dependability of the response.