1. A computer-implemented system for visually suggesting classification for inclusion-based document cluster spines, comprising the steps of: a computer processor configured to execute code, comprising: a designation module configured to designate a set of reference documents each associated with a classification code; an obtaining module configured to obtain a different set of uncoded documents; a combination module configured to combine one or more of the coded reference documents with a plurality of uncoded documents into a combined document set; a grouping module configured to group the documents in the combined document set into clusters; an organizing module configured to organize the clusters along one or more spines, each spine comprising a vector; and a suggestion module configured to provide a visual suggestion for assigning one of the classification codes to one of the spines comprising visually representing each of the reference concepts in the clusters along that spine.