1. A guided natural language interface comprising: computer readable memory which stores a set of issue description templates, each template being configured for guiding a user in formulating a problem statement characterizing, in natural language, a problem related to color identified in an input document; and a natural language rendering engine, executed by a processor, which receives information input by at least one of a user and an associated problem detector, and instantiates one of the templates in response thereto, the natural language rendering engine configured for presenting the problem statement to the user as it is refined by the template in accordance with user inputs, and communicating information based on the refined problem statement to an associated problem corrector.